| File extension | Developer/Producer | File description |
|---|---|---|
| !BT file extension | BitTorrent | Incomplete BitTorrent Download Format |
| !C file extension | Newera Software Technology Inc. | Graphics Converter Pro Format |
| !QB file extension | qBittorrent | QBittorrent Incomplete Download Format |
| !UT file extension | BitTorrent | UTorrent Incomplete Download Format |
| #$# file extension | Corel Corporation | ULead Photoimpact Temporary Format |
| $ file extension | Microsoft Corporation | Visual Basic Symbol Format |
| $$A file extension | IBM | OS/2 Format |
| $? file extension | N/A | TR-DOS ZX Spectrum File In HOBETA Format |
| $B file extension | Vladimir Kladov | TR-DOS Basic File Format |
| $D file extension | Vladimir Kladov | TR-DOS Data File Format |
| $D$ file extension | IBM | OS/2 Planner Data Format |
| $DX file extension | CA Technologies | CA Visual Objects Backup Index Format |
| $ED file extension | Microsoft Corporation | Microsoft C++ Editor Temporary Format |
| $LN file extension | Micro Focus International plc | Borland C++ TLink Response Format |
| $RR file extension | Steinberg Media Technologies GmbH | Steinberg Cubase Compressed Format |
| $VM file extension | Microsoft Corporation | Windows 3.x Virtual Manager Temporary Format |
| (D) file extension | Symantec Corporation | PcAnywhere Temporary Format |
| * file extension | Apple, Inc. | Apple Mac OS X Certificate Assistant Format |
| --- file extension | Microsoft Corporation | Temporary Format |
| 000 file extension | Microsoft | Microsoft Windows CE Installation Data Format |
| 001 file extension | SplitJoin | Generally Split Archive Or Backup File (001-??? File Sequence) |
| 003 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal Format |
| 004 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal Format |
| 005 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal Format |
| 006 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal Format |
| 007 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal Format |
| 009 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal Format |
| 00A file extension | Bentley Systems, Incorporated | Bentley GEOPAK Resource Format |
| 00B file extension | Bentley Systems, Incorporated | Bentley GEOPAK Resource Format |
| 00C file extension | Intuit Canada Limited | ProFile 2000 Autosave Format |
| 00D file extension | Bentley Systems, Incorporated | Bentley GEOPAK Resource Format |
| 00E file extension | Bentley Systems, Incorporated | Bentley GEOPAK Resource |
| 00F file extension | Bentley Systems, Incorporated | Bentley GEOPAK Resource |
| 00_ file extension | bhv Publishing GmbH | Winfunktion Mathematic V8.0 Julia Fractal |
| 010 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 011 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 012 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 013 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 014 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 015 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 016 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 017 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 018 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 021 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 022 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 025 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 026 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 027 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 028 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 029 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 031 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 033 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 034 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 035 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 036 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 037 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 038 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 039 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 040 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 041 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 043 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 045 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 046 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 047 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 048 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 050 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 051 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 052 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 053 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 054 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 055 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 056 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 057 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 058 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 059 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 05_ file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 060 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 061 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 062 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 063 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 064 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 065 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 066 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 067 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 068 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 069 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 06I file extension | Intuit Inc. | ProSeries Tax |
| 06_ file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 070 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 071 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 072 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 073 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 074 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 076 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 077 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 078 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 079 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 07G file extension | Intuit Inc. | ProSeries Tax |
| 07I file extension | Intuit Inc. | ProSeries Tax |
| 080 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 083 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 084 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 089 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 08I file extension | Intuit Inc. | QuickBooks Return Tax |
| 098 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 099 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 09I file extension | Intuit Inc. | ProSeries Tax |
| 09T file extension | BHOK IT Consulting | StudioTax 2009 Income Tax |
| 0NV file extension | Red Hat, Inc. | Cygwin Terminfo |
| 0RV file extension | Red Hat, Inc. | Cygwin Terminfo |
| 1 file extension | N/A | Unix Unformatted Manual Page |
| 10 file extension | IBM | IBM Voice Type Languages Scripts Data |
| 101 file extension | Nuance Communications, Inc. | Omnipage Ocr |
| 102 file extension | Nuance Communications, Inc. | Omnipage Ocr |
| 103 file extension | Nuance Communications, Inc. | Omnipage OCR |
| 104 file extension | Nuance Communications, Inc. | Omnipage OCR |
| 105 file extension | bhv Publishing GmbH | Winfunktion Mathematic V8.0 Julia Fractal |
| 106 file extension | bhv Publishing GmbH | Winfunktion Mathematic V8.0 Julia Fractal |
| 107 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 108 file extension | Nuance Communications, Inc. | Omnipage Ocr |
| 109 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 10NV file extension | Red Hat, Inc. | Cygwin Terminfo |
| 10RV file extension | Red Hat, Inc. | Cygwin Terminfo |
| 110 file extension | Nuance Communications, Inc. | OmniPage OCR |
| 111 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 112 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 114 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 115 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 116 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 117 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 118 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 119 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 12 file extension | IBM | IBM Voice Type Languages Scripts Data |
| 120 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 121 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 122 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 124 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 125 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 126 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 127 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 128 file extension | Nuance Communications, Inc. | Omnipage OCR |
| 129 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 12A file extension | Microsoft Corporation | Microsoft Windows |
| 12M file extension | IBM | Lotus Smartmaster |
| 13 file extension | IBM | IBM Voice Type Languages Scripts Data |
| 130 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 131 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 132 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 133 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 134 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 135 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 136 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 137 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 138 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 139 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 13T file extension | Intuit Canada Limited | Intuit Profile Premier |
| 14 file extension | IBM | IBM Voice Type Languages Scripts Data |
| 140 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 141 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 142 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 143 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 144 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 145 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 146 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 147 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 148 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 149 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 15 file extension | IBM | IBM Voice Type Languages Scripts Data |
| 150 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 151 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 152 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 153 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 154 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 155 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 156 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 157 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 158 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 159 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 16 file extension | IBM | IBM VoiceType Languages Scripts Data |
| 160 file extension | Nuance Communications, Inc. | Omnipage Ocr |
| 161 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 162 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 163 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 164 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 165 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 166 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 167 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 168 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 169 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 17 file extension | IBM | IBM Voice Type Languages Scripts Data |
| 170 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 171 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 172 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 173 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 174 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 176 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 178 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 179 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 18 file extension | IBM | IBM Voice Type Languages Scripts Data |
| 180 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 181 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 182 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 183 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 184 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 185 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 186 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 187 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 188 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 189 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 190 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 191 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 192 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 193 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 194 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 195 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 196 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 197 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 198 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 199 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 1M file extension | Red Hat, Inc. | Cygwin Main |
| 1PA file extension | Intuit Inc. | QuickBooks Form |
| 1T file extension | IBM | Fortran |
| 2 file extension | IBM | IBM Embedded ViaVoice Voice Type Languages Scripts Data |
| 20 file extension | N/A | Linux |
| 200 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 202 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 203 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 204 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 205 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 206 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 207 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 208 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 209 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 210 file extension | Star Finanz GmbH | StarMoney Bpd Hbcioffl 280 |
| 211 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 214 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 215 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 216 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 217 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 218 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 219 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 22 file extension | Ubisoft Entertainment S.A. | Salt Lake Winter Olympics 2002 Game Music |
| 220 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 221 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 222 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 223 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 224 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 225 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 226 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 227 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 228 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 229 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 230 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 231 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 233 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 234 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 235 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 236 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 237 file extension | N/A | Winfunktion Mathematic V8.0 Julia Fractal |
| 238 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 239 file extension | N/A | Winfunktion Mathematik V8.0 Julia Fractal |
| 25NV file extension | Red Hat, Inc. | Cygwin Terminfo |
| 25RV file extension | Red Hat, Inc. | Cygwin Terminfo |
| 2C file extension | The FreeBSD Foundation | FreeBSD |
| 2DK file extension | IBM | OS/2 Saved SKF Format |
| 2DL file extension | Graphisoft | ArchiCAD 2D Lines Data |
| 3 file extension | IBM | IBM Embedded ViaVoice Voice Type Languages Scripts Data |
| 320 file extension | Psi | Scream Tracker 32 |
| 323 file extension | N/A | H.323 Internet Telephony Format |
| 340 file extension | Dionex Corporation | Chromelion Demo Data Format |
| 3DC file extension | RacerMate | RacerMate 3D Course Format |
| 3H file extension | Global Publishing Solutions Ltd, UK | 3B2 Tag Header |
| 3IN file extension | Microsoft Corporation | MSN Setup Information |
| 3PM8 file extension | Apple, Inc. | Apple MAC OS X |
| 3TF file extension | SAP AG | Crystal Reports |
| 3TH file extension | Microsoft Corporation | Microsoft 3D Movie Maker Thumbnail Data |
| 3X file extension | Red Hat, Inc. | Cygwin Main |
| 4 file extension | IBM | IBM Embedded ViaVoice Voice Type Languages Scripts Data |
| 42M file extension | Four Js Development Tools, Inc. | Genero Report Writer BDL Functions |
| 47 file extension | N/A | FreeBSD |
| 4DR file extension | N/A | 4th Dimension Data Resource |
| 4DS file extension | 4D, Inc. | 4th Dimension Database Windows Data Segment |
| 4DX file extension | 4D, Inc. | 4th Dimension Plugin |
| 4FI file extension | 4D, Inc. | 4th Dimension Insider Format |
| 4SW file extension | JP software | 4DOS Swap |
| 5 file extension | N/A | FreeBSD |
| 500 file extension | Tally Solutions Pvt. Ltd. | Tally |
| 5A file extension | N/A | Linux |
| 5D file extension | Microsoft Corporation | Microsoft Works |
| 5VW file extension | InfoVista | 5Views Packet Capture |
| 5XB file extension | Line 6, Inc. | POD HD500X Bundle |
| 6 file extension | IBM | IBM Embedded ViaVoice Voice Type Languages Scripts Data |
| 67C file extension | Flexera Software, Inc. | FLEXnet Manager |
| 7 file extension | IBM | IBM Embedded ViaVoice Voice Type Languages Scripts Data |
| 7INI file extension | Adobe Systems Incorporated | Adobe Extensions Manager |
| 8 file extension | IBM | IBM Embedded ViaVoice Voice Type Languages Scripts Data |
| 822 file extension | Parametric Technology Corporation | Pro/Engineer WildFire |
| 83P file extension | Texas Instruments | TI-83 Calculator Program |
| 850 file extension | Microsoft Corporation | Visual Foxpro 98 |
| 852 file extension | Microsoft Corporation | Microsoft Visual FoxPro |
| 866 file extension | Microsoft Corporation | Visual Foxpro 98 |
| 89U file extension | Texas Instruments Inc. | Texas Instruments TI-89 OS Upgrade |
| 8B? file extension | Impressum | Photoline Extension |
| 8BA file extension | N/A | Adobe PhotoShop Extension |
| 8BAM file extension | Adobe Systems Incorporated | Adobe Photoshop For Mac Plugin |
| 8BBR file extension | Adobe Systems Incorporated | Adobe Photoshop Brushes |
| 8BC file extension | N/A | Adobe Photoshop 5.0 Sdk Plugins Format |
| 8BCO file extension | Adobe Systems Incorporated | Adobe Photoshop For Mac Color Table |
| 8BCT file extension | Adobe Systems Incorporated | Adobe Photoshop For Mac Palette |
| 8BDT file extension | Adobe Systems Incorporated | Adobe Photoshop For Mac Duotone |
| 8BE file extension | N/A | Adobe PhotoDeluxe Extension |
| 8BEM file extension | Adobe Systems Incorporated | Adobe Photoshop Path |
| 8BF file extension | Adobe Systems | Adobe Plug-in Filter Format |
| 8BFK file extension | Adobe Systems Incorporated | Adobe Photoshop For Mac Commands And Plugins |
| 8BFM file extension | Adobe Systems Incorporated | Adobe Photoshop For Mac Filter |
| 8BI file extension | N/A | Adobe Photoshop Plugins Formats Format |
| 8BI8 file extension | Adobe Systems | Adobe PhotoShop Plugin Format |
| 8BL file extension | Adobe Systems | Adobe PhotoShop Plugin Format |
| 8BP file extension | Adobe Systems Incorporated | Adobe PhotoShop Import |
| 8BPI file extension | Adobe Systems Incorporated | Adobe Photoshop Extension |
| 8BS file extension | Adobe Systems | Adobe Photoshop Selection Extension |
| 8BX file extension | N/A | PhotoDeluxe Extension |
| 8BXM file extension | Adobe Systems Incorporated | Adobe Photoshop For Mac Extension |
| 8BY file extension | N/A | PhotoDeluxe Extension |
| 8BYM file extension | N/A | Adobe Photoshop |
| 8LI file extension | Adobe Systems | Adobe Photoshop Scripting Plugin |
| 8LY file extension | Adobe Systems Incorporated | Adobe Photoshop Plugin |
| 8TY file extension | Adobe Systems Incorporated | Adobe Photoshop |
| 8XC file extension | N/A | Texas Instruments TI-82-Plus Complex |
| 8XP file extension | Texas Instruments | TI-83 Plus Calculator Program |
| 9 file extension | IBM | IBM Embedded ViaVoice Voice Type Languages Scripts Data |
| 917 file extension | Trend Micro Inc. | Trend Antivirus Format |
| 92D file extension | N/A | Texas Instruments TI-92 |
| ?RS file extension | Corel Corporation | Corel WordPerfect Support |
| @@1 file extension | StreamingStar Technology Inc. | HiDownload Temporary |
| @@2 file extension | StreamingStar Technology Inc. | HiDownload Temporary |
| A$V file extension | Quark, Inc. | QuarkXpress Automatically Saved Project |
| A21 file extension | BSS Audio | Soundweb Firmware |
| A2A file extension | IBM | IBM Voice Type Languages Vocabels |
| A31 file extension | Adobe Systems Incorporated | Adobe Authorware Library |
| A3P file extension | Carnegie Mellon University | Alice 3 Project |
| A41 file extension | Adobe Systems Incorporated | Adobe Authorware Library |
| A4R file extension | N/A | Adobe Authorware Package Course |
| A51 file extension | Adobe Systems Incorporated | Adobe Authorware Library |
| A5D file extension | N/A | Adobe Authorware Model |
| A5M file extension | N/A | Adobe Authorware Unpackaged |
| A5P file extension | N/A | Adobe Authorware Package Without Runtime |
| A5RPT file extension | Alpha Software, Inc. | Alpha Five Project Report |
| A6D file extension | N/A | Adobe Authorware Model |
| A6L file extension | N/A | Adobe Authorware Library |
| A6M file extension | N/A | Adobe Authorware Unpackaged |
| A6R file extension | N/A | Adobe Authorware Packaged File Without Runtime |
| A6W file extension | N/A | Adobe Authorware Unpackaged |
| A7D file extension | Adobe Systems Incorporated | Adobe Authorware Model |
| A7L file extension | N/A | Adobe Authorware Library |
| A7M file extension | N/A | Adobe Authorware Unpackaged |
| A7W file extension | N/A | Adobe Authorware Unpackaged |
| AAA file extension | Sybase Inc. | Sybase SQLAnywhere Temporary |
| AAD file extension | Amazon.com, Inc. | Audible Download Plugin |
| AAP file extension | UltraTech Group | LexNavigator Information Update |
| AAPKG file extension | Invensys plc | ArchestrA IDE Package |
| AAS file extension | Adobe Systems Incorporated | Adobe Authorware Shocked Packet |
| AAT file extension | Esri | ArcInfo Line Data |
| AATREND file extension | Invensys Systems, Inc. | ActiveFactory Trend |
| AAUI file extension | Adobe Systems | Adobe Acrobat UI Settings Format |
| AAWDEF file extension | Lavasoft | Ad-Aware Definitions Format |
| AB4 file extension | ENIAC Computing | AB4 Accounting & Business Data |
| AB6 file extension | AndersonBell Corp | ABStat Data |
| AB8 file extension | AndersonBell Corp | ABStat Data |
| ABA file extension | Avant Force | Avant Browser Add-on Format |
| ABCDG file extension | Apple, Inc. | Apple AddessBook |
| ABCDP file extension | Apple, Inc. | Address Book Card Data |
| ABD file extension | N/A | Text Adventure Authoring System |
| ABE file extension | N/A | Application Boundaries Enforcer |
| ABI file extension | AbiSource | AbiWord Extension |
| ABL file extension | BOC Information Technologies Consulting AG | ADONIS Application Business Library |
| ABN file extension | Alpha Software, Inc. | Alpha Five |
| ABR file extension | Adobe Systems | Adobe Photoshop Brush Format |
| ABT file extension | Advanced Business Technology Corporation | The Arbiter Game Schedule |
| ABU file extension | The Sage Group plc | ACT! E-mail Address Book |
| AC$ file extension | Autodesk | AutoCAD Undo Info Format |
| AC0 file extension | National Instruments Corporation | SPICE AC/frequence Domain Output |
| AC1 file extension | National Instruments Corporation | SPICE AC/frequence Domain Output |
| AC2 file extension | National Instruments Corporation | SPICE AC/frequency Domain Output |
| AC4 file extension | National Instruments Corporation | SPICE AC/frequence Domain Output |
| AC7 file extension | National Instruments Corporation | SPICE AC/frequence Domain Output |
| AC8 file extension | National Instruments Corporation | SPICE AC/frequence Domain Output |
| AC9 file extension | National Instruments Corporation | SPICE AC/frequence Domain Output |
| ACA2 file extension | FontLab Ltd. | Fontographer |
| ACB file extension | AOL | AOL Cab Launcher Format |
| ACCDA file extension | Microsoft | Microsoft Access 2007/2010 Add-in Format |
| ACCDU file extension | Microsoft | Microsoft Access 2007/2010 Database Wizard Format |
| ACCESSOR file extension | Microsoft Corporation | Microsoft Visual Studio Accessor |
| ACGD file extension | Johns Hopkins University | ACG System Predictive Model |
| ACGL file extension | Johns Hopkins University | ACG System Licence |
| ACH file extension | Rockwell Automation, Inc. | RSLogix 5 Project |
| ACI file extension | ACI | ACI Development Appraisal |
| ACK file extension | N/A | Swifty |
| ACL file extension | Microsoft | Microsoft Office Automatic Correction List |
| ACLOCK file extension | Amazing-Clock.com | Amazing Clock |
| ACMD file extension | Zecos Software | Apache Commander Project |
| ACQ file extension | GT Technologies | AcqURL Bookmark Manager |
| ACROPLUGIN file extension | Adobe Systems | Adobe Acrobat Plug-in Format |
| ACRS file extension | Adobe Systems Incorporated | Adobe Authorware |
| ACS file extension | Microsoft | Microsoft Agent Character Structured Storage Format |
| ACSM file extension | Adobe Systems | Adobe Content Server Message Format |
| ACT! file extension | The Sage Group plc | Act! |
| AD file extension | Berkeley Systems | After Dark Screen Saver Format |
| AD3E file extension | Adobe Systems Incorporated | Adobe Dimensions Mac |
| AD65 file extension | Adobe Systems Incorporated | PageMaker 6.5 |
| ADADOWNLOAD file extension | Adobe Systems | Adobe Download Assistant Partially Completed Download Format |
| ADBLOCK file extension | Alpha Software, Inc. | Alpha Five Temporary |
| ADD file extension | Microsoft | Microsoft Dynamics AX Developer Documentation Format |
| ADDON file extension | Zaplots | CFS Console Add-on Format |
| ADH file extension | Amazon.com, Inc. | Audible Manager |
| ADI file extension | Microsoft | Microsoft Dynamics AX Developer Documentation Index Format |
| ADIUMEMOTICON file extension | The Adium Team | Adium Dock Icon |
| ADIUMEMOTICONSET file extension | The Adium Team | Adium Emoticon Set |
| ADIUMLIBPURPLEPLUGIN file extension | The Adium Team | Adium Lib Purple Plugin |
| ADIUMMESSAGESTYLE file extension | The Adium Team | Adium Message Style |
| ADIUMPLUGIN file extension | The Adium Team | Adium Plugin |
| ADIUMSERVICEICONS file extension | The Adium Team | Adium Service Icons |
| ADIUMSTATUSICONS file extension | The Adium Team | Adium Status Icon |
| ADL file extension | openEHR | Archetype Definition Language |
| ADLS file extension | openEHR | ADL Workbench |
| ADM file extension | N/A | Portfolio Admin-level Access Flag Format |
| ADOBEBRIDGE file extension | Adobe Systems Incorporated | Adobe Bridge |
| ADOBENET file extension | Adobe Systems Incorporated | Adobe Production Studio |
| ADTG file extension | N/A | Advanced Data TableGram |
| AEF file extension | CA Technologies | Visual Objects Application Export |
| AEPKEY file extension | InterCrypto | Advanced Encryption Package Key Format |
| AER file extension | Adobe Systems Incorporated | Adobe Atmosphere |
| AFG file extension | JHI Plant Bioinformatics Group | Tablet Assembly |
| AFL file extension | DeLorme | XMap Related |
| AFPLOC file extension | Apple | Apple Mac OS X Filing Protocol Location Format |
| AFR file extension | N/A | FreeBSD |
| AFZ file extension | Ancestry.com Inc. | Family Tree Backup |
| AG file extension | IBM | Lotus Agenda |
| AG4 file extension | Microsoft Corporation | Microsoft Access G4 |
| AGD file extension | Oracle | Agile Advantage Format |
| AGD2 file extension | Adobe Systems Incorporated | Adobe FreeHand 7 For Mac |
| AGENT file extension | Forté Inc. | Forte Agent And FreeAgent Data |
| AGF file extension | Esri | Atlas GIS Native Binary Geodataset |
| AGMODULE file extension | Adobe Systems Incorporated | Adobe Lightroom Module |
| AGTOOLKIT file extension | Adobe Systems Incorporated | Adobe Photoshop Lightroom |
| AGW file extension | Aspen Research Group Ltd. | Aspen Graphics |
| AGWL file extension | Distributed and Parallel Systems - University of Innsbruck | Abstract Grid Workflow Language |
| AGX file extension | IBM | Rational XDE |
| AGX1 file extension | Adobe Systems Incorporated | Adobe FreeHand For Mac Extension |
| AH file extension | The FreeBSD Foundation | FreeBSD |
| AHD file extension | Microsoft | Microsoft Dynamics AX On-line Help Data Format |
| AHF file extension | Anadigm | AnadigmDesigner ASCII Code |
| AHI file extension | Microsoft | Microsoft Dynamics AX Online Help Index Format |
| AHP file extension | Autodesk, Inc. | AutoCAD Help |
| AI65 file extension | Adobe Systems Incorporated | Adobe PageMaker For Mac Extension |
| AIF file extension | Symbian | Symbian OS EPOC Application Information Format |
| AIH file extension | Esri | Attribute Index |
| AIJ file extension | Oracle Corporation | Oracle After-Image Journal |
| AIL file extension | Mystik Media | AutoImager |
| AIM file extension | AOL | AOL Instant Message Launch Format |
| AIP file extension | N/A | Adobe Illustrator Plugin Format |
| AIRAPPLICATION file extension | Adobe Systems Incorporated | Adobe AIR Application |
| AIRPORTS file extension | Knife Edge Software | RealFlight Airports Data |
| AJG file extension | AJC Systems Ltd. | AJC Grep Project |
| AKF file extension | Adobe Systems Incorporated | Adobe Acrobat Key |
| AKW file extension | Adobe Systems Incorporated | Adobe RoboHelp Help Project Index Designer |
| AL3 file extension | ACORD | Electronic Data Interchange |
| ALA file extension | Birch Grove Software, Inc. | ActivTrak Log Analysis |
| ALARMZ file extension | Francis Gagné | Alarmz Alarm |
| ALB6 file extension | Adobe Systems Incorporated | Adobe PageMaker For Mac |
| ALBUM file extension | N/A | Thumbnail Cache |
| ALC4 file extension | Adobe Systems Incorporated | Adobe PageMaker For Mac Dictionary |
| ALCO file extension | Alco Blom | URL Manager Pro |
| ALD2 file extension | Adobe Systems Incorporated | Adobe Pagemaker For Mac |
| ALD3 file extension | Adobe Systems Incorporated | Adobe PageMaker 3 For Mac |
| ALD4 file extension | Adobe Systems Incorporated | Adobe Pagemaker 4 For Mac |
| ALD6 file extension | Adobe Systems Incorporated | Adobe PageMaker 6 For Mac |
| ALDF file extension | Stichting Aldfaer | Aldefaer Data |
| ALF6 file extension | Adobe Systems Incorporated | PageMaker Default |
| ALH5 file extension | Adobe Systems Incorporated | Adobe PageMaker Add-in |
| ALM file extension | Alpha Software, Inc. | Alpha Five Database Information |
| ALMB file extension | N/A | Mac OS 8.1 Action Module Data |
| ALMN file extension | Apple, Inc. | Location Manager Module |
| ALP file extension | Ableton | Ableton Live Pack Format |
| ALT file extension | Microsoft | Microsoft Dynamics AX Temporary Format |
| ALT4 file extension | Adobe Systems Incorporated | Adobe Pagemaker For Mac |
| ALTH file extension | Excel Software | QuickHelp For Mac |
| ALTP file extension | Excel Software | QuickHelp |
| ALTV file extension | N/A | QuickView Help |
| ALY file extension | The Sage Group plc | Sage ACT! |
| AM3 file extension | Indigo Rose Corporation | AutoPlay Menu Studio Ver.3 Data |
| AMAYA file extension | W3C | Amaya |
| AMD file extension | ETAS | ASCET XML Model Description |
| AME file extension | The Sage Group plc | ACT! E-mail System Library |
| AMI file extension | Parametric Technology Corporation | Cocreate SolidDesigner Annotation |
| AMIPRO file extension | N/A | Ami Pro Table Structure |
| AMJ file extension | MechCAD | AceMoney |
| AML file extension | Microsoft | Microsoft Assistance Markup Language |
| AMO file extension | AOL Inc. | AIM AOL Instant Messenger UI Extension |
| AMODEL file extension | KAISHA-Tec Co. Ltd | ActiveModeler Project |
| AMT file extension | N/A | Abbyy Finereader 5.0 Pro |
| AMT50 file extension | N/A | BERNINA V5.0 Embroidery Software Template |
| AMT60 file extension | N/A | BERNINA V6.0 Embroidery Software Template |
| AMW file extension | IBM | SPSS AMOS Data |
| AMX file extension | N/A | Admin Mod Plug-in Format |
| AMXX file extension | N/A | AMX Mod X Plug-in Format |
| ANAT file extension | N/A | XNBC Network Anatomy |
| ANC file extension | Planit Solutions Inc. | Alphacam NC Program |
| ANH file extension | Birch Grove Software, Inc. | ActivTrak Net View History |
| ANISO file extension | Chemical Crystallography Laboratory, Oxford | Chemical Crystallography |
| ANNOT file extension | Adobe Systems | Adobe Digital Editions Annotations Format |
| ANR file extension | DeLorme | DeLorme Street Atlas Route |
| ANT file extension | SFR GmbH | CalcAnt Saved Calculation |
| AO file extension | Green Parrots Software | ActionOutline Data |
| AOD file extension | Microsoft | Microsoft Dynamics AX Object Data Format |
| AOI file extension | Microsoft | Microsoft Dynamics AX Application Object Index Format |
| AOL file extension | AOL | America On-line Related Format |
| AP0 file extension | Microsoft Corporation | Microsoft Windows APW_data |
| AP2 file extension | Promethean World plc | ActivInspire Resource Pack |
| AP3 file extension | Asprova Corporation | Asprova Project |
| APC file extension | WILDPACKETS, INC. | AiroPeek Wireless Trace Capture |
| APCDOC file extension | Ashampoo GmbH & Co. KG | Ashampoo Photo Commander |
| APD file extension | GNstudio | Eclipse Plugin Descriptor Format |
| APDETECTED file extension | Apple, Inc. | Apple IPhoto |
| APE file extension | Nullsoft | Winamp Plug-ins AVS Format |
| APERTUREEDIT file extension | Apple, Inc. | Apple Aperture |
| APERTUREEXPORT file extension | Apple, Inc. | Apple Aperture |
| APF file extension | Adobe Systems | Adobe Acrobat Profile Format |
| APFACENAME file extension | Apple, Inc. | Apple IPhoto Face Data |
| APG file extension | OC Systems, Inc. | PowerAda Aprobe |
| API file extension | Adobe Systems | Adobe Acrobat Plugin Format |
| APJ file extension | N/A | FreeBSD |
| APL file extension | ACD Systems | ACDSee Plug-in Format |
| APLG file extension | RapidSolution Software | Audials One Add-on Format |
| APLMODEL file extension | Apple, Inc. | Apple ICal |
| APLN file extension | Adobe Systems Incorporated | Adobe InDesign 3rd Party Extension |
| APLP file extension | RapidSolution Software | Audials One Add-on Installation Package Format |
| APP-SE file extension | N/A | Sony Ericsson XPERIA X10 |
| APPDATA file extension | VMware, Inc. | VMware Cache |
| APPDOWNLOAD file extension | Apple | Mac OS X App Store Incomplete Download Format |
| APPICON file extension | VMware, Inc. | VMWare Cache |
| APPLESYNCINFO file extension | Apple, Inc. | IOS |
| APPUP file extension | Erlang | Erlang Application Upgrade Format |
| APSMARTALBUM file extension | Apple, Inc. | Apple Aperture |
| APVAULT file extension | Apple, Inc. | Apple Aperture Vault |
| APW file extension | Adobe Systems Incorporated | Adobe Authorware Packaged |
| AQ1 file extension | RJ Software | AptiQuiz Test |
| AQA file extension | RJ Software | AptiQuiz Result |
| AQP file extension | Articulate Global, Inc. | Quizmaker 08 And Older Quiz |
| AQQ file extension | AQQ Sp. z o.o. | AQQ Extension |
| AQZ file extension | N/A | Amateur Radio Questionary Data |
| ARN file extension | DeLorme | XMap Flight Plan |
| ARPACK file extension | Ambient Design | ArtRage Package |
| ARPI file extension | N/A | Adobe Extension |
| ARR file extension | Elcomsoft | Advanced RAR Password Recovery Project Format |
| ART50 file extension | BERNINA International AG | BERNINA V5.0 Embroidery Software Designs |
| ART60 file extension | BERNINA International AG | BERNINA V6.0 Embroidery Software Designs |
| ARTF file extension | Adobe Systems Incorporated | Adobe FreeHand Xtra |
| ARTX file extension | Extensoft, Inc. | Artisteer Project |
| ARTZ file extension | Adobe Systems Incorporated | Adobe Illustrator For Mac |
| ARU file extension | N/A | Autorun.aru Malicious |
| ARX file extension | Autodesk | AutoCAD Runtime Extension Format |
| AS$ file extension | Microsoft Corporation | Microsoft Word Temporary |
| AS2 file extension | Promethean World plc | ACTIVstudio Resource |
| AS3A file extension | Promethean World plc | ActivInspire Resource |
| ASCM file extension | Adobe Systems Incorporated | Adobe Content Server Message |
| ASEP file extension | Milk Farm Software, ltd. | Separator For Mac |
| ASH file extension | N/A | Nintendo Wii System Menu Format |
| ASHLANG file extension | Ashampoo GmbH & Co. KG | Ashampoo Media Player+ |
| ASN file extension | Rising Sun Solutions, Inc. | Atlantis Word Processor Sound Scheme |
| ASO file extension | Adobe Systems Incorporated | Adobe Flash Cache |
| ASPR file extension | ASPACK SOFTWARE | ASProtect Related |
| ASS file extension | N/A | Advanced SubStation Alpha Subtitle Format |
| ASSISTANT file extension | Hewlett-Packard Company | HP Printer Utility For Mac Assistant Plugin |
| AST2 file extension | Fantiusen Software | Astrotite |
| AT65 file extension | Adobe Systems Incorporated | Adobe Pagemaker For Mac |
| ATB file extension | Anet | AnetHelp Tools |
| ATD file extension | Microsoft Corporation | Microsoft Systems Management Server |
| ATLOC file extension | Apple, Inc. | Apple Mac OS X Finder |
| ATMC file extension | Adobe Systems Incorporated | Adobe Type Manager |
| ATOMS file extension | M.Carson | Ribbons Atoms |
| ATV file extension | The Sage Group plc | ACT! |
| ATX file extension | Hash | Animation Master Plugin Format |
| ATZ file extension | N/A | Atomic Time Zone Format |
| ATZ3 file extension | VSoft Technologies Pty Ltd | Automise |
| AUM file extension | Adobe Systems Incorporated | Adobe Update Manager Data |
| AURX file extension | Andrew Gryc | AutoREALM Project |
| AUS file extension | Andrew Gryc | AutoREALM Symbols |
| AUZ file extension | Ableton | Ableton Authorization Format |
| AVASTLIC file extension | AVAST Software | Avast! License Format |
| AVG file extension | Rainer Goebel | BrainVoyager QX Event Related Averaging |
| AVGDX file extension | AVG Technologies | AVG Diagnostic Format |
| AVM file extension | AVG Technologies (Grisoft) | AVG Incremental Persistent |
| AVST file extension | Avery Lee | VirtualDub Template |
| AVX file extension | ESRI | ArcView Extension Plugin Format |
| AWC file extension | Emulex | Emulex AWC Firmware Update Format |
| AWD file extension | ASUS | Award BIOS Update Format |
| AWF file extension | Adobe Systems Incorporated | Adobe WorkFlow Workgroup Plugin |
| AWI file extension | Audacity | Audacity Wave Information |
| AWKW file extension | Awkwords | Awkwords Word Generator Format |
| AWR file extension | Lavasoft | Ad-Aware Reference |
| AWSHORTCUT file extension | ActiveWord Systems, Inc. | ActiveWords Shortcut |
| AWX file extension | Microsoft Corporation | Microsoft DirectX |
| AX file extension | N/A | DirectShow Filter Format |
| AX3 file extension | APEX SOFTWARE | Apex Sketch |
| AXQ file extension | Richardson Software, LLC | Edit Rocket Ada Editor |
| AXW file extension | Actix International Limited | Analyzer StateForms |
| AZ file extension | Corel Corporation | WinDVD Related |
| AZ! file extension | Vuze | Vuze Partial Download Format |
| AZW3F file extension | N/A | Amazon Kindle Metadata |
| AZW3R file extension | N/A | Amazon Kindle Metadata |
| B25 file extension | David Pilling | Ovation Pro For RISC OS DDL |
| B4U file extension | Transparent Language | Before You Know It |
| B5 file extension | MDBG | MDBG Chinese-English Dictionary |
| B6L file extension | VSO-Software | Blindwrite License |
| BABL file extension | Automated Media Processing Solutions | DeBabelizer |
| BACK file extension | N/A | RMCProfile Coefficient |
| BAG file extension | N/A | AAICWpro Autoresponder |
| BAK2 file extension | Microsoft Corporation | Microsoft FrontPage |
| BAMP file extension | Blumentals Solutions SIA | Easy Button & Menu Maker Project |
| BAN file extension | Ai Research | MegaHAL Non-keyword List |
| BASEBINARY file extension | Apple, Inc. | Apple Mac OS X AirPort Base Station Binary |
| BASEPROJ file extension | Heracle BioSoft | DNA Baser Sequence Aligner Project |
| BAV file extension | RITLABS | AVG Bat! Plugin Format |
| BAW file extension | BrainLED | BrainLED AlfaWave Session |
| BB2 file extension | N/A | XBBS-OS/2, XGROUP, AV, ZTree Archiver Control |
| BBI file extension | Ventyx | LinkOne Data |
| BBL file extension | Oren Patashnik | TeX/BibTeX Bibliographic Reference Format |
| BBLM file extension | Bare Bones Software | BBEdit Language Module |
| BBLX file extension | Rick Meyers | E-Sword Bible |
| BBT file extension | CyberSports, Inc. | CyberSports For Basketball Team |
| BC file extension | BitComet | BitTorrent Unfinished Download Format |
| BC! file extension | BitComet | Bittorrent Unfinished Download Format |
| BCB file extension | Embarcadero Technologies, Inc. | Borland C++ Builder |
| BCH file extension | Phoenix Software International | Datalex Entrypoint 90 Data |
| BD2 file extension | Intuit Inc. | Lacerte Tax Tax |
| BDCM file extension | Microsoft Corporation | Microsoft Visual Studio BDC Model |
| BDCR file extension | Microsoft Corporation | Microsoft Visual Studio BDC Resource |
| BDCT file extension | Bare Bones Software | BBEdit Dictionary |
| BDE file extension | Parametric Technology Corporation | Pro/ENGINEER Temporary |
| BDG file extension | I2S Finance | BudgetExpress Data |
| BDI file extension | Parametric Technology Corporation | Pro/ENGINEER Temporary |
| BDJO file extension | Oracle Corporation | Java BD-J Object Descriptor |
| BDOC file extension | SK.ee | DigiDoc Client Container |
| BDR file extension | Microsoft | Microsoft Publisher Border Format |
| BDSGROUP file extension | Embarcadero Technologies, Inc. | BDS Project Group |
| BDT file extension | ABBYY | Lingvo Dictionary |
| BDTD file extension | Oracle Corporation | Java Sun Binary DTD |
| BDV file extension | Softwin | BitDefender Vault |
| BDW file extension | Snowmint Creative Solutions LLC | Budget Data |
| BDX file extension | Softwin | BitDefender |
| BEA file extension | Cadsoft Corporation | BIM Energy Analysis |
| BEB file extension | Clint Garrity | EEC Analyzer |
| BEH file extension | School of Aquatic & Fishery Sciences, University of Washington | CRiSP Calibration |
| BEL file extension | Haliplex Pty Ltd. | HPXView Binary Event Log Archive |
| BEN file extension | SiSoftware | SiSoftware Sandra |
| BEVEL file extension | Neuber Software | FontTwister Bevel |
| BEX file extension | PGP Corporation | PGP Binary Extracted Public Key |
| BFC file extension | N/A | Microsoft Windows 95 Briefcase Document Format |
| BFP file extension | Quest Software, Inc. | Benchmark Factory Project |
| BFR file extension | SmartWare Corporation | SmartWare Backup Report |
| BGO file extension | BigOven.com | Bigoven Recipe Card |
| BGR file extension | Promixis | Girder Binary Plugin |
| BHF file extension | Symantec Corporation | PcAnywhere Host |
| BHP file extension | AppSmiths | BHP Survey Tool Data |
| BID file extension | Avontus Software Corporation | BidMaker |
| BIN3 file extension | National Instruments Corporation | LabVIEW Data |
| BJK file extension | Statistics Netherlands | Blaise |
| BKD file extension | N/A | Book Library Local Dos Exploit |
| BKG file extension | N/A | UWXAFS Project Binary Format Data |
| BKMK file extension | Yummy Software | Yummy FTP Bookmark Format |
| BKR file extension | N/A | ReplaceEm File Set |
| BKY file extension | N/A | Bookkey Bookmark/keyword Data |
| BKZ file extension | BaKoMa Soft | BaKoMa TeX Installation Module |
| BLA file extension | Adobe Systems Incorporated | Adobe Black Colour Separation |
| BLL file extension | Exelis Visual Information Solutions | ENVI Bad Lines List |
| BLU file extension | N/A | FileMaker Pro Runtime Extension Format |
| BLUEBUTTON file extension | U.S. Department of Veterans Affairs | VA Blue Button Text |
| BMB file extension | Parametric Technology Corporation | Pro/ENGINEER Temporary |
| BMC file extension | N/A | Embroidery Graphic Format |
| BMD5 file extension | EdwinSoft | BookmarkingDaemon |
| BMI file extension | Autodesk | 3d Studio Max Plugin |
| BMK file extension | Nokia | Bookmark Format |
| BMT file extension | Alpha Software, Inc. | Alpha Five Image Library |
| BMW file extension | N/A | W32/Liji-A Virus |
| BND file extension | IBM | DB2 Bind Format |
| BNF file extension | IBM | IBM Voice Type Languages Map |
| BNL file extension | Cadence Design Systems, Inc. | MicroSim PCBoard Netlist |
| BOF file extension | IBM | IBM Voice Type Languages Tasks Enroll |
| BONDS file extension | M.Carson | Ribbons Bonds |
| BOOTSKIN file extension | Stardock | Microsoft Windows Boot Skin |
| BP file extension | Fabio Chelly | BankPerfect Account |
| BP2 file extension | N/A | Autodesk AutoCAD Batch Plot Format |
| BP3 file extension | N/A | Autedesk AutoCAD Batch Plot Format |
| BPC file extension | TODAY Systems, Inc. | BuildPro |
| BPDX file extension | Adobe Systems | Adobe Acrobat Catalog Batch PDX Format |
| BPI file extension | IBM | IBM Voice Type Languages New User |
| BPJ file extension | VISATON GmbH & Co. KG | Boxsim Simulation |
| BPL file extension | N/A | AutoCAD R2000 Batch Plot |
| BPS file extension | N/A | BPS Virus Format |
| BPV file extension | BulletProof Business Plans, Inc. | BallPark Business Valuation Valuation Scenario |
| BPX file extension | manager-pro.com | BusiPlan |
| BQF file extension | N/A | Backdoor.Win32.Ciadoor.bqf Trojan |
| BQY file extension | Brio Software | BrioQuery Database Format |
| BR file extension | TigerLogic Corp. (Omnis Technology Corporation) | Omnis Data |
| BR1 file extension | Ghisler Software GmbH | Total Commander Cached Button Bar Icons |
| BR2 file extension | Ghisler Software GmbH | Total Commander Cached Button Bar Icons |
| BRA file extension | Various Linux developers | Linux |
| BRAGG file extension | N/A | Bragg Profile |
| BRB file extension | DAZ 3D Inc. | Bryce Object Export |
| BREW file extension | N/A | Homebrew |
| BRI file extension | DAZ Productions | Bryce Plug-in Format |
| BRIDGECACHE file extension | Adobe Systems Incorporated | Adobe Bridge Cache |
| BRIDGECACHET file extension | Adobe Systems Incorporated | Adobe Bridge Cache |
| BRIDGELABELSANDRATINGS file extension | Adobe Systems Incorporated | Adobe Bridge |
| BRIDGESORT file extension | Adobe Systems Incorporated | Adobe Bridge Cabinet |
| BRM file extension | DAZ Productions | Bryce Plug-in Format |
| BRO file extension | DAZ Productions | Bryce Extension |
| BRU file extension | N/A | Brutus Restore |
| BRV file extension | BraveTech Inc. | BraveViewer Thumbnail Cache |
| BRY2 file extension | DAZ 3D Inc. | Bryce 2 |
| BSCS file extension | AKS-Labs | Balanced Scorecard Designer |
| BSCT file extension | AKS-Labs | Balanced Scorecard Designer Strategy |
| BSDF file extension | ZEMAX Development Corporation | ZEMAX Scattering Distribution Data |
| BSE file extension | School of Aquatic & Fishery Sciences, University of Washington | CRiSP Harvest |
| BSI file extension | N/A | Microsoft SharePoint Server 2007 Temporary |
| BSM file extension | N/A | BeerSmith Mash Profile |
| BSMX file extension | BeerSmith LLC | BeerSmith |
| BSN file extension | Autodesk, Inc. | Autodesk TR-55 Detention Basin Storage Data |
| BSPROJ file extension | Banned Story development team | Banned Story Project |
| BSQ file extension | N/A | Control |
| BST file extension | N/A | BiblioTex Format |
| BSW file extension | Microsoft Corporation | Business Scorecard Manager Workspace |
| BSX file extension | N/A | PBASIC Preprocessor Output |
| BSY file extension | Paul Rädle | VTrain Learning Cardfile |
| BT! file extension | BitSpirit | BitSpirit Incomplete Download Format |
| BT0 file extension | PG Music Inc. | Band-in-a-Box Temporary |
| BT1 file extension | West Mountain Radio | Battery Analyzer Test |
| BT2 file extension | Lars Sams | Batch Barcode Maker |
| BT5 file extension | ERP5 Community | ERP5 Business Template |
| BTH file extension | Jeppesen Marine, Inc. | Bathy Recorder Data |
| BTKEY file extension | BitTorrent, Inc. | BitTorrent License Key |
| BTL file extension | SolidWorks Corporation | SolidWorks Sheet Metal Bend Table |
| BTST file extension | Symantec Corporation | Norton SystemWorks Info |
| BTU file extension | Diablo Analytical, Inc. | Diablo BTU Calculator |
| BTWSENDTO file extension | Microsoft Corporation | Microsoft Windows Bluetooth Related |
| BU file extension | David Harris | Pegasus Mail Temporary |
| BUF file extension | N/A | Buffer Format |
| BUGSENSE file extension | Bugsense Inc. | BugSense |
| BUL file extension | The NSR Physiome Project | Bullseye Data Format |
| BUNDLE file extension | Apple | Mac OS X Application Extension |
| BV1 file extension | Corel Corporation | Corel WordPerfect Overflow |
| BV2 file extension | Corel Corporation | Corel WordPerfect Overflow |
| BV3 file extension | Corel Corporation | Corel WordPerfect Overflow |
| BV4 file extension | Corel Corporation | Corel WordPerfect Overflow |
| BV5 file extension | Corel Corporation | Corel WordPerfect Overflow |
| BV6 file extension | Corel Corporation | Corel WordPerfect Overflow |
| BV7 file extension | Corel Corporation | Corel WordPerfect Overflow |
| BV8 file extension | Corel Corporation | Corel WordPerfect Overflow |
| BV9 file extension | Corel Corporation | Corel WordPerfect Overflow |
| BVC file extension | IBM | IBM Voice Type Languages Newuser |
| BVI file extension | IBM | IBM Voice Type Languages Newuser |
| BVXD file extension | Bravura Software, LLC | OptiTune Manifest |
| BWE file extension | LionHead Studios | Black And White 2 Environment Data |
| BWM file extension | Statistics Netherlands | Blaise |
| BX file extension | Opera Software ASA | Opera |
| BXI file extension | Statistics Netherlands | Blaise |
| BXM file extension | NetMedia, Inc. | BasicX-24 Basic Express Compiler Map |
| BXU file extension | Sony Corporation | PictureGear Studio |
| BY file extension | Cadence Design Systems, Inc. | PSpice |
| BZM file extension | Esri | Business Map |
| BZZ file extension | Link-Assistant.com | BuzzBundle Project |
| C11 file extension | SINTEF | CARE-S InfoWorks User Defined Pollutant Detail |
| C1S file extension | N/A | Photo Cache |
| C21 file extension | SINTEF | CARE-S InfoWorks Defined Pollutant Detail |
| C2K file extension | Microsoft Corporation | Microsoft Project Holidays |
| C2U file extension | Texas Instruments | Texas Instruments CBL 2 Format |
| C2W file extension | Bentley Systems, Incorporated | WaterCAD |
| C2X file extension | N/A | WinOnCD |
| C3D1 file extension | CambridgeSoft Corporation | Chem3D Cartesian 1 Chemical Modeller |
| C3D2 file extension | CambridgeSoft Corporation | Chem3D Cartesian 2 Chemical Modeller |
| C4DUPDATE file extension | MAXON Computer GmbH | Cinema 4D Update |
| CA file extension | N/A | Telnet Server Initial Cache Data Format |
| CA2 file extension | Embarcadero Technologies, Inc. | Delphi Install Disk12 |
| CA4 file extension | Embarcadero Technologies, Inc. | Delphi Installation |
| CA5 file extension | Embarcadero Technologies, Inc. | Delphi Installation |
| CABAL file extension | N/A | Haskell Cabal |
| CAC file extension | N/A | Clock Alarm |
| CACHE file extension | N/A | Generally Cache Format |
| CACHE-2 file extension | VideoLAN Project Team | VLC Media Player Font Cache |
| CACHE-3 file extension | N/A | VLC Media Player Font Cache |
| CACHE2 file extension | Parametric Technology Corporation | Pro/Engineer |
| CAH file extension | Corel Corporation | Ulead Photo Explorer Thumbnail Cache |
| CALB file extension | Coolect | Coolect Album Format |
| CALIBRE file extension | Calibre | Calibre Device Data Format |
| CALIBZ file extension | Chief Architect, Inc. | Chief Architect Symbol |
| CALX file extension | Microsoft Corporation | Calendar Printing Assistant Template |
| CANF file extension | Abbot Systems | CanOpener |
| CARO file extension | N/A | Adobe Acrobat Creatorcode |
| CAS file extension | Autodesk | Autodesk AutoCAD License Format |
| CAT4D file extension | MAXON Computer GmbH | Cinema 4D Catalog |
| CATOM file extension | Chief Architect, Inc. | Chief Architect Catalogue |
| CB1 file extension | SINTEF | CARE-S InfoWorks Biochemical Oxygen Detail |
| CB4 file extension | Actuate Corporation | Actuate Analytics |
| CBB file extension | ChessBase GmbH | ChessBase Search Booster |
| CBD file extension | Corel Corporation | Corel WordPerfect Dictionary |
| CBDS file extension | Nicom00k | Comic Book DS Format |
| CBM file extension | N/A | Microsoft Interactive Training |
| CBN file extension | j2 Global Communications, Inc. | PaperMaster Cabinet |
| CBO file extension | Microsoft Corporation | Microsoft Interactive Training |
| CBPLUGIN file extension | The Code::Blocks Team | Code::Blocks Plugin |
| CBPROJ file extension | Embarcadero Technologies, Inc. | C++ Builder Project |
| CBT file extension | Microsoft | Computer Based Training |
| CBX file extension | IBM | Rational XDE |
| CBXML file extension | Shpakovski | CodeBox XML Library |
| CC1 file extension | Briggs Softworks | Briggs Softworks Calendar Commander |
| CCC file extension | Olle Persson | Bibexcel |
| CCE file extension | N/A | Calendar Creator 2 Event |
| CCIP file extension | Curse | Curse Client 4 Addon Download Protocol Format |
| CCJ file extension | WordWeb Software | Crossword Compiler Compiled Crossword Applet |
| CCL file extension | Translucent Dragon | CCTools Levelset |
| CCO file extension | Apple, Inc. | Apple Cocoa |
| CCWSLN file extension | Rockwell Automation, Inc. | Connected Components Workbench |
| CCX file extension | N/A | Click & Create Extension |
| CDF-MS file extension | Microsoft | ClickOnce Deployment Binary Manifest Format |
| CDFX file extension | Indexing Research | Cindex |
| CDJ file extension | Padus, Inc. | DiscJuggler CD-ROM Data |
| CDL file extension | Computer Systems Odessa | ConceptDraw PRO Library Format |
| CDRW file extension | Apple, Inc. | ClarisWorks Claris Draw |
| CDRX file extension | Robert Bosch GmbH | Bosch Crash Data Retrieval Data Format |
| CDS file extension | Embarcadero Technologies, Inc. | Delphi TClientDataset Data |
| CDV file extension | Square Box Systems Ltd. | CatDV Catalog |
| CE0 file extension | N/A | Winewar Worm |
| CEB file extension | Apabi | Apabi EBook Format |
| CELL file extension | Castep team | CASTEP Supercell Material Data |
| CEO file extension | N/A | Winewar Worm |
| CERTSIGNINGREQUEST file extension | Apple, Inc. | Apple Mac OS X Certificate Assistant |
| CET file extension | N/A | Hitachi Cobol |
| CETRAINER file extension | N/A | DBVM |
| CF5 file extension | DocuWare AG | DocuWare |
| CF7 file extension | Toshiba Corporation | Toshiba ConfigFree Profile Handling Module |
| CFB file extension | Cleverfiles | Disk Drill Recovered |
| CFDI file extension | N/A | Comprobante Fiscal Digital Por Internet |
| CFK file extension | N/A | Microsoft Developer Studio Diagram |
| CFL file extension | IMVU | IMVU Product Format |
| CFP file extension | ProgramArts Software Co., Ltd. | C-Free Project |
| CFPRESET file extension | N/A | SA Color Finesse Plugin For Adobe After Effects |
| CFW file extension | PerkinElmer Inc. | ChemFinder Form |
| CFX file extension | MAGIX AG | Magix Movie Edit Pro |
| CFXXE file extension | N/A | Possibly Malware |
| CGD file extension | N/A | CricketGraph Data |
| CGINC file extension | Unity Technologies | Unity Custom Shader Include |
| CGT file extension | Gold Parsing System Team | Gold Parsing System Compiled Grammar Table |
| CH file extension | eSignal | ESignal |
| CH10 file extension | Bob Baggerman | Irig 106 Original Recording |
| CH4 file extension | Nanotec | WSxM |
| CH5 file extension | Department of Energy (DOE) Advanced Simulation and Computing Initiative (ASCI) | VisIt |
| CHAP file extension | N/A | MP4 Movie Chapter |
| CHARMM file extension | The CHARMM Development Project | CHARMm Chemical Modeller Input |
| CHATLOG file extension | N/A | Adium Chat Log |
| CHI file extension | Microsoft Corporation | Microsoft Help Index |
| CHJ file extension | IBM | IBM SPSS Interview Cache |
| CHK file extension | N/A | ScanDisk File Fragment |
| CHKN file extension | IMVU, Inc. | IMVU Create Mode Temporary |
| CHKSPLIT file extension | Incredible Bee | Incredible Bee Archiver Checksum |
| CHO file extension | Hash, Inc. | Animation:Master Choreography |
| CHQ file extension | Microsoft Corporation | Microsoft Help Combined Full-text Search |
| CHUNK001 file extension | Filesplitter.org | File Splitter Split File (part 1) |
| CHW file extension | Microsoft | Microsoft Help HTML Help General Index Format |
| CID file extension | Omar F. Reis | Navigator Chart Image Description |
| CII file extension | Intergraph Corporation | Caesar II |
| CIK file extension | Symantec Corporation | Norton CleanSweep Installation Log |
| CIM file extension | General Electric Company | GE CIMPLICITY HMI Screen |
| CIN96LM file extension | Microsoft Corporation | Microsoft Cinemania |
| CIN96UPD file extension | Microsoft Corporation | Microsoft Cinemania Format |
| CIO file extension | Grassland, Soil & Water Research Laboratory | SWAT Master Watershed |
| CIR file extension | Cadence Design Systems, Inc. | PSpice Circuit |
| CIRC file extension | Logisim Team | Logisim Circuit |
| CIS file extension | VicTech Software | CheckInbox |
| CIW file extension | N/A | Web Of Science Export |
| CIX file extension | IBM | Rational XDE |
| CK1 file extension | SINTEF | CARE-S InfoWorks Kjeldahl Nitrogen Detail |
| CL file extension | Aha-Soft | IconUtils Mouse Cursor Library Format |
| CL3 file extension | N/A | Easy CD Creator CD Layout |
| CLAM file extension | Adobe Systems Incorporated | Adobe InDesign Dictionary |
| CLAS file extension | Oracle Corporation | Java Class |
| CLASSDIAGRAM file extension | Microsoft Corporation | Microsoft Visual Studio Class Diagram |
| CLC file extension | N/A | Microsoft Schedule+ 7 Habits Mission Statement |
| CLDCVT file extension | N/A | CD-LabelPrint Converted Data |
| CLE file extension | Moon Valley Software, Inc. | Icon Lock-iT Locked File Indicator |
| CLEO file extension | CLEO | Grand Theft Auto Vice City Mod Format |
| CLF file extension | Ilium Software, Inc. | ListPro |
| CLI file extension | HawkSoft | Client Management System Customer |
| CLIPPING file extension | Apple, Inc. | Apple Mac OS X Finder |
| CLKK file extension | N/A | Clicker Keyboard Format |
| CLKT file extension | N/A | Clicker Template Format |
| CLKW file extension | N/A | Clicker Word Bank Format |
| CLKX file extension | N/A | Clicker Grid Set Format |
| CLL file extension | Crick Software Ltd. | Crick Software Clicker |
| CLO file extension | IBM | SPSS Chart Look |
| CLPPRJ file extension | CodeLobster Software | CodeLobster PHP Edition Project |
| CLR file extension | Adobe Systems | Adobe Flash Color Table Format |
| CLS file extension | N/A | LaTeX Format |
| CLU file extension | Heikki Hannikainen | Clusse Node |
| CM3 file extension | LexisNexis | CaseMap Data |
| CM4 file extension | Thornsoft Development, Inc. | ClipMate Data |
| CM5 file extension | N/A | LexisNexis Case Analysis |
| CM8 file extension | LexisNexis | CaseMap Case |
| CMB file extension | Propellerhead Software AB | Reason Combinator Instrument Patch |
| CMC file extension | Bitz & Pixelz BV | Comic Collector Collection Data |
| CMDF file extension | CrystalMaker Software Ltd. | CrystalMaker Data |
| CMDT file extension | Apple, Inc. | Claris Dictionary |
| CMI file extension | Yoriyuki Yamagata | Camomile Interface |
| CMM file extension | Corel | Corel Multimedia Manager Album Format |
| CMMCD file extension | TechSmith Corporation | Camtasia Studio MenuMaker Project |
| CMN file extension | Microsoft Corporation | Systems Management Server (SMS) Update |
| CMO file extension | Dassault Systèmes S.A. | 3DVIA Virtools Behavioral Server Composition |
| CMR file extension | WinWare, Inc. | CribMaster |
| CMRBK file extension | LexisNexis | CaseMap ReportBook Definition |
| CMT file extension | Centre for Corporate Culture | Culturemetrics |
| CMTX file extension | Rick Meyers | E-Sword Commentary |
| CMW file extension | Microsoft Corporation | Microsoft Office Custom Maintenance Wizard Data |
| CMY file extension | Corel Corporation | CorelDRAW Custom |
| CN file extension | Procedimientos-Uno, S.L. | CNwin/MLwin Account |
| CN3 file extension | National Center for Biotechnology Information | CN3D |
| CNB file extension | David Harris | Pegasus Mail Noticeboard Mail Stored Message |
| CNK file extension | Microsoft Corporation | Microsoft Dynamics GP Chunk |
| CNO file extension | Teldas GmbH | INet-Server Error Description |
| CNR file extension | David Harris | Pegasus Mail Mail Message Stored In Systemwide Folder |
| CNX file extension | David Harris | Pegasus Mail |
| CO file extension | Cycore System AB | Cult3D ActiveX Player Application |
| COA file extension | Medlin Accounting | Medlin Payroll Software Chart |
| COC file extension | Olle Persson | Bibexcel |
| CODAPLUGIN file extension | Panic | Coda For Mac Plugin Format |
| COE file extension | N/A | Xilinx BRAM Initialization |
| COK file extension | Teldas GmbH | INet-Server Error Report |
| COLLOQUYTRANSCRIPT file extension | Javelin.cc | Colloquy Chat Transcript |
| COLOR file extension | Neuber Software | FontTwister Color Gradient |
| COLORPICKER file extension | Apple | Apple Mac OS X Color Picker Component |
| COLORS file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Makelogo Color |
| COMMANDERDOC file extension | Apple, Inc. | Apple Qmaster |
| COMMON file extension | MathWorks, Inc. | MATlab Install |
| COMP file extension | Freescale Semiconductor, Inc. | CodeWarrior Compiler |
| COMPARISON file extension | Araxis Ltd. | Merge Comparison Report |
| COMPLETE file extension | KJB Software development | SendSafe Deciphered E-message |
| COMPO file extension | N/A | DAZ 3D Carrara Pro 7 Or 8 Temporary |
| COMPONENT file extension | N/A | Mac OS X System Component |
| COMPONENTDIAGRAM file extension | Microsoft Corporation | Microsoft Visual Studio Component Diagram |
| COMPOSITIONMODEL file extension | Invantive BV | Invantive Composition Data Model |
| CONSOLE file extension | Microsoft Corporation | Widows NT Console |
| CONTENTPROJ file extension | Microsoft Corporation | XNA Game Studio Game Content Project |
| CONTENTS file extension | Apple, Inc. | MAC OS X |
| CONTENTSOFCLIPBOARD file extension | Microsoft Corporation | WinXP Powertoy |
| CONTOUR file extension | Mariner Software | Contour Screenplay Format |
| COOL file extension | Sierra Vista Software | QB - Text Analyzer Vocabulary List |
| COORDS file extension | M.Carson | Ribbons Coords |
| COS2 file extension | Pinnacle Systems | Pinnacle Studio Cache Format |
| COUNTER file extension | NetObjects Inc. | NetObjects Fusion Components Bbscomp Message |
| COX file extension | N/A | Click & Create Extension |
| CP1 file extension | SINTEF | CARE-S InfoWorks Phosphorus Detail |
| CP3 file extension | Microprose | Grand Prix 3 Cockpit Shape Format |
| CPO file extension | Corel Corporation | Corel Print House Data |
| CPT file extension | N/A | Pocket Slides Presentation Format |
| CPT2 file extension | GForce | M-Tron Pro Library |
| CPU file extension | N/A | Sisoftware Sandra |
| CQT file extension | IDEAlliance | MAIL.DAT Container Quantity Data |
| CR1 file extension | Campbell Scientific, Inc. | LoggerNet CRBasic Source |
| CR5 file extension | Spectra Precision | Survey Pro Coordinate |
| CRASHED file extension | AbiSource | AbiWord Crash-saved Document Format |
| CRC file extension | Ghisler Software | Total Commander CRC Format |
| CRD file extension | Microsoft | Microsoft Windows Cardfile Database Format |
| CRH file extension | Procedimientos-Uno, S.L. | EN-CC Truss Geometry |
| CRI file extension | SAP AG | Crystal Reports |
| CRP file extension | dataBased Intelligence, Inc. | Visual DBASE Custom RePort |
| CRS3 file extension | Nuance Communications, Inc. | OmniPage Lite |
| CRX file extension | Google Chrome Extension Installer File Format | |
| CSAC file extension | macropool GmbH | Web Research Collection Optimization Temporary |
| CSATTR file extension | Microsoft Corporation | Microsoft Visual Studio Attractor |
| CSDPROJ file extension | Microsoft Corporation | C# Device Project |
| CSH file extension | Adobe Systems | Adobe Photoshop Shapes Format |
| CSOM file extension | QUALCOMM Incorporated | Eudora For Mac |
| CSSTORE file extension | Apple, Inc. | Apple Mac OS X Cache |
| CT0 file extension | Tajima Group | Tajima TBF Condition |
| CT1 file extension | Microsoft Corporation | SMS Proposed Site Control |
| CT7 file extension | LexisNexis | CaseMap Case Analysis Template |
| CT8 file extension | LexisNexis | CaseMap Case Template |
| CTBL file extension | N/A | Xamine NSCL |
| CTF file extension | AVG Technologies | AVG Antivirus Update Control Format |
| CTMDPI file extension | RWTH Aachen University | MRMC Markov Reward Model Checker Matrix |
| CTO file extension | Microsoft Corporation | Microsoft Visual Studio Binary Command Table Output |
| CTR file extension | Rainer Goebel | BrainVoyager QX Contrast |
| CTSYM file extension | Microsoft Corporation | Microsoft Visual Studio Command Table Output |
| CU1 file extension | Impressum | Photoline 4 Curve |
| CU3 file extension | Impressum | Photoline Curves Clut |
| CU? file extension | Impressum | Photoline Clut |
| CUF file extension | Embarcadero Technologies, Inc. | Turbo C Utilities Form Definition |
| CUL file extension | N/A | IconForge ImageForge Cursor Library |
| CURSEMOD file extension | Curse Inc. | Curse Client Mod |
| CUST file extension | Quark, Inc. | QuarkXPress Mac File Type |
| CUTECUTPROJECT file extension | MobiVio Solutions | Cute Cut Project |
| CV file extension | N/A | Microsoft CodeView Information Screen |
| CVF file extension | CPUID | CPU-Z Validation Format |
| CVR file extension | Microsoft | Microsoft Office Crash Report Format |
| CVT file extension | ACD Systems | Canvas External Tool Format |
| CVZ file extension | Lone Wolf Development, Inc. | Card Vault Inventory |
| CW7 file extension | Codeware, Inc. | COMPRESS Related |
| CWIE file extension | Freescale Semiconductor, Inc. | CodeWarrior |
| CWL file extension | Apple, Inc. | ClarisWorks Library |
| CWLINK file extension | Freescale Semiconductor, Inc. | CodeWarrior |
| CWM file extension | IBM | WebSphere Map Designer Express Map Definition |
| CWR file extension | SAP AG | Crystal Reports Report |
| CXA file extension | ANSYS Inc. | ANSYS Fluent Animation Metadata |
| CXB file extension | Custody X Change | Custody X Change Data |
| CXF file extension | Google Picasa Collage Format | |
| CXL file extension | Pervasive Software Inc. | Business Integrator Extract Schema |
| CXML file extension | Microsoft Corporation | Microsoft Silverlight Server Side Data |
| CXQ file extension | N/A | SillyDl.CXQ Downloading Trojan |
| CXV file extension | Custody X Change | Custody X Change Data |
| CYL file extension | M.Carson | Ribbons Cylinder |
| CZ file extension | N/A | Czech Language Translation |
| CZN file extension | N/A | RMCProfile Atom List |
| C_ file extension | Microsoft Corporation | Microsoft Winhelp Compressed |
| D02 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D03 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D05 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D07 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D08 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D10 file extension | Bob Baggerman | IRIG 106 Recording Directory |
| D11 file extension | NorthStar Solutions, LLC. | Macro Mania Data |
| D2A file extension | N/A | Avisynth MPAsource Plugin Scan |
| D2CT file extension | John Norstadt | Disinfectant For Mac |
| D32 file extension | N/A | Lotus Visualisation |
| D43 file extension | IAR Systems | IAR Debug |
| DA file extension | Nagarsoft | Direct Access Command Pack |
| DA$ file extension | N/A | Microsoft Compressed DAT |
| DA2 file extension | Lavasoft | Ad-Aware License Format |
| DA4 file extension | Naviter d.o.o. | SeeYou Waypoint |
| DAB file extension | AB SCIEX | AB SCIEX Analyst Software Data Acquisition Batch |
| DAC file extension | Dynacom Technologies Inc. | Dynacom Accounting Data |
| DAD2 file extension | N/A | Canvas For Mac |
| DAI file extension | Dream Aquarium | Dream Aquarium Patch |
| DAL file extension | SpeedBit | Download Accelerator Plus DAP List Format |
| DAN file extension | DanMedical Ltd. | D-MAS Analysis System Patient |
| DAP file extension | SpeedBit | Download Accelerator Partial Download Format |
| DAQ file extension | MathWorks, Inc. | Data Acquisition Toolbox |
| DARTCLIP file extension | Dartfish | Dartfish Metadata |
| DAT file extension | Microsoft | Exchange E-mail Attachment |
| DAT-SHM file extension | eM Client Inc. | EmClient Data |
| DAT2 file extension | Donald Lessau | XYplorer Thumbnail Cache |
| DATACONTRACT file extension | N/A | Web Service Software Factory Installer |
| DAWG file extension | Eliot Development Team | Eliot Dictionary |
| DA_ file extension | GkWare e.K. | GKSetup Support |
| DB file extension | Microsoft | Windows XP Thumbnail Database |
| DB$ file extension | dataBased Intelligence, Inc. | DBASE Temporary |
| DB0 file extension | dataBased Intelligence, Inc. | DBASE Init |
| DB2IND file extension | Microsoft Corporation | Microsoft Visual Studio DB2 Index |
| DB2SP file extension | Microsoft Corporation | Microsoft Visual Studio DB2 Create Procedure Statement |
| DB2UDF file extension | Microsoft Corporation | Microsoft Visual Studio DB2 User Defined Function |
| DBAG file extension | SYNAMETIRCS | WinSQL DataBag |
| DBAT file extension | Intuit Inc. | Quicken For Mac Data |
| DBLINK file extension | Altium Limited. | Altium Designer Database Link |
| DBMANIFEST file extension | Microsoft Corporation | Database Manifest |
| DBMC file extension | AOL Inc. | Netscape Cache Log |
| DBNW file extension | AOL Inc. | Netscape News |
| DBSCHEMA file extension | Microsoft Corporation | Database Schema |
| DBX file extension | Microsoft | Microsoft Outlook Express E-mail Folder Format |
| DC0 file extension | The OpenBSD Project | OpenBSD |
| DC1 file extension | N/A | Bloomba E-mail Message Format |
| DCDC file extension | Gold Disk Inc. | Astound Presentation |
| DCOVER file extension | BeLight Software | BeLight Disc Cover Format |
| DCPIL file extension | Embarcadero Technologies, Inc. | Delphi Compiler Symbolic Information |
| DCPY file extension | Apple, Inc. | Disk Copy |
| DCT file extension | N/A | Spell Checking Dictionary Format |
| DCT5 file extension | Microsoft Corporation | Microsoft Word 5 For Mac Dictionary |
| DCTMP file extension | DC++ | DC++ Partially Downloaded Format |
| DCTX file extension | Microsoft Corporation | Microsoft Office IME Open Extended Dictionary |
| DCTXC file extension | Microsoft Corporation | Microsoft Office IME Open Extended Dictionary |
| DDE file extension | The Sage Group plc | Sage MAS 90 Data |
| DDM file extension | Alpha Software, Inc. | Alpha Five Table Objects |
| DDOC file extension | SK.ee | DigiDoc Client Container |
| DDR file extension | Microsoft Corporation | Systems Management Server (SMS) Discovery Data Record |
| DDX file extension | Alpha Software, Inc. | Alpha Five Data Dictionary Index |
| DEBIAN file extension | Debian Project Team | Debian Related |
| DECK file extension | Microsoft Corporation | Microsoft Office For Mac Query |
| DECRYPT file extension | Microsoft | Microsoft Windows 8 Decrypted ESD Format |
| DEE file extension | N/A | Creator Simulator Description |
| DEFORM file extension | Neuber Software | FontTwister Deform Guide Line |
| DEK file extension | Side-Eight | Memorize-It Flashcards Deck Format |
| DEL file extension | N/A | PCTracker Undelete Tracking |
| DELF file extension | N/A | Malicious Or Virus |
| DES-SE file extension | Google Inc. | Sony Ericsson XPERIA X10 |
| DESCRIPTION file extension | N/A | Multilizer PDF Translator Description |
| DESKTOP file extension | N/A | DesktopX Windows Desktop Theme Format |
| DEU file extension | Adobe Systems Incorporated | Adobe Reader German Language |
| DEVICESALT file extension | Barnes & Noble | Nook Encrypted Format |
| DF file extension | Corel Corporation | Corel Paradox Table Filter |
| DF10 file extension | Bob Baggerman | IRIG 106 Recording Directory |
| DFL file extension | Freshdevices Corp. | Fresh Download List |
| DFP file extension | eyeon | Eyeon Fusion Plugin Format |
| DFR file extension | The Database Managers, Inc. | DataFlex Installation Serial Number |
| DFU file extension | N/A | LaTeX Font Encoding Format |
| DG-KEY file extension | GipsyMedia Ltd | DigiGuide Key |
| DG3 file extension | RockWare, Inc. | DeltaGraph |
| DGC file extension | N/A | TurboTax Tax Form Format |
| DGF file extension | Adobe Systems Incorporated | Adobe Acrobat |
| DGI file extension | N/A | HDConvertToX Input |
| DGL file extension | N/A | DynaGeo License |
| DGM file extension | DesSoft | DesSoft Diagram |
| DGPRINT file extension | GipsyMedia Ltd | DigiGuide Print Template |
| DGR file extension | DARTECH, Inc. | DART Pro 98 |
| DGX file extension | IBM | IBM Rational XDE |
| DHY file extension | Adobe Systems Incorporated | Adobe Bridge |
| DIC file extension | N/A | Dictionary Format |
| DICT file extension | Sunnysoft s.r.o. | Sunnysoft InterWrite |
| DID file extension | Adobe Systems Incorporated | Adobe Distiller/Bridge |
| DIL file extension | Embarcadero Technologies, Inc. | Delphi |
| DIN file extension | Sapphire Group | DataEase Installation Script |
| DIP file extension | Nic Wilson & Jonathan Wilson | DVDINFOPro Saved Data Graph |
| DIR00 file extension | N/A | Disk Defrag Error Or Dump |
| DISABLED file extension | Safer Networking | Spybot - Search & Destroy Disabled Format |
| DISKDEFINES file extension | N/A | Linux LiveCD Information Format |
| DIST-RDB file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Scoring |
| DISTZ file extension | Apple, Inc. | Apple Mac OS X Installer Distribution |
| DJ file extension | Delorie Software | DJGPP Docs |
| DJA file extension | Dundjinni Enterprises, Inc. | DunDjinni |
| DJF file extension | NTI Corporation | NTI Drive Backup |
| DKE file extension | CenterTools | DriveLock FDE Disk Key Format |
| DKLANG file extension | DK Software | DKLang Translation Editor Translation |
| DL0 file extension | ABBYY | Abbyy Finereader 4.0 Sprint |
| DLB file extension | N/A | Troj/Dloadr-AHT |
| DLCT file extension | Apple, Inc. | AppleScript Dialect |
| DLE file extension | Autodesk, Inc. | 3D Studio Max Plugin |
| DLI file extension | N/A | Win32.Sober.AD@mm |
| DLL1 file extension | Splashtop Inc. | ASUS ExpressGate (Splashtop) |
| DLLX file extension | N/A | Backdoor.Bot |
| DLL_NON_OPT file extension | Adobe Systems Incorporated | Adobe |
| DLL_RESP file extension | Microsoft Corporation | Microsoft Windows Live Messenger Contact Related |
| DLM file extension | Akamai | Akamai Download Manager Format |
| DLO file extension | N/A | 3D Studio Max Plugin Format |
| DLPF file extension | Microcosm Ltd. | DinkeyLook Diagnostic Information |
| DLU file extension | Autodesk | 3D Studio Max Utility Plug-in Format |
| DLV4 file extension | Dassault Systèmes S.A. | Catia |
| DLZ file extension | CPT | Crossword Power Tools Crossword Library |
| DMFR file extension | WestByte Software | Download Master Incomplete Download |
| DMMS file extension | Seavus DOOEL | DropMind Map Style |
| DMN file extension | SAS Institute Inc. | SAS Metadata |
| DMX-INFO file extension | Innovative Solutions | DriverMax Driver Information Format |
| DMY file extension | PhysioNet | SEMIA LTST DB Time Series Data |
| DND file extension | European Bioinformatics Institute | ClustalW2 Tree |
| DNL file extension | DNAML | DNAML EBook Format |
| DNN file extension | DotNetNuke Corp. | DotNetNuke Manifest |
| DNX file extension | IBM | IBM Rational Software |
| DOCK file extension | TLA Systems Ltd. | DragThing Dock |
| DOCKLET file extension | Stardock Corporation | ObjectDock Docklet |
| DOE file extension | Rockwell Automation, Inc. | Rockwell Arena Model |
| DOI file extension | Actuate Corporation | BiRT Data Object Instance |
| DON file extension | N/A | OpenOffice.org Log |
| DONE file extension | Red Hat, Inc. | Cygwin Post-install |
| DONOTPRESENT file extension | Apple, Inc. | Apple Mac OS X Time Machine Resource Fork |
| DOP file extension | Voyetra Turtle Beach, Inc. | Digital Orchestrator Pro |
| DOST file extension | Sony Corporation | DoStudio Subtitle Format |
| DOWNLOADING file extension | Pando Networks | Pando Incomplete Download Format |
| DOXY file extension | Dimitri van Heesch | Doxygen |
| DPB file extension | N/A | FaxMaster Document |
| DPC file extension | Microsoft Corporation | Microsoft Office Resource |
| DPCACHE file extension | Apple, Inc. | Apple IPhoto Cache |
| DPI file extension | Adlib Software | Adlib Express Document Processing Information Settings |
| DPM file extension | Digidesign | Pro Tools Plugin Format |
| DPO file extension | Embarcadero Technologies, Inc. | Delphi Object Repository |
| DPRJ file extension | DRD Systems, Inc. | VideoReDo TVSuite DVD Project |
| DPRO file extension | Apple, Inc. | MacDraw Pro |
| DR file extension | N/A | OMA Open Mobile Alliance DRM Rights Object Format |
| DR3 file extension | VMAN | V-Control Import Driver |
| DRB file extension | Dr. Software LLC | Dr. Beam |
| DRC file extension | N/A | OMA Open Mobile Alliance DRM Rights Object Format |
| DRE file extension | DÖRR EDV-Beratung | DReport Exported Report |
| DRI file extension | Microsoft Corporation | Microsoft SQL Server Replication |
| DRR file extension | Altium Limited. | Altium Designer Drill Report |
| DRS file extension | Corel Corporation | Corel WordPerfect Driver Resource |
| DRT file extension | Cadence Design Systems, Inc. | PSpice Or PCB Designer Custom Derating |
| DRWR file extension | Sig Software | Drop Drawers Drawer |
| DRX file extension | Adobe Systems Incorporated | Adobe Photoshop Tutorial |
| DSC file extension | Nikon | Nikon Coolpix Disk Identification Format |
| DSFT file extension | Microsoft Corporation | Microsoft Application Virtualization Differential SFT |
| DSIM file extension | Andreas Herz | Digital Simulator |
| DSJT= file extension | N/A | Adobe Director For Resources |
| DSKIN file extension | Mr. Gecko | DockX Skin Format |
| DSL file extension | MacUpdate LLC | Damaged Sector List |
| DSPROTOTYPE file extension | Microsoft Corporation | Microsoft Visual Studio Prototype |
| DSQ file extension | Measurement Computing | Dasylab Worksheet |
| DSR file extension | Exelis Visual Information Solutions | ENVI Density Slice Range |
| DSSLIDESHOW file extension | Idea2 s.c. | Desktop Sidebar Slideshow Panel |
| DST file extension | N/A | Tajima Embroidery Format |
| DSTL file extension | N/A | Acrobat Distiller |
| DSTUDIO file extension | Conceiva | DownloadStudio Incomplete Download Format |
| DSU file extension | Schneider Electric S.A. | ProWORX Nxt Data Setup |
| DT4 file extension | N/A | BioSonics Data |
| DT? file extension | Terry A. Davis | LoseThos Data |
| DTAPART file extension | MMIV-MMVII | DownThemAll Download Part Format |
| DTB2 file extension | Netopia, Inc., a Motorola Company | Timbuku Pro DropIn |
| DTC file extension | Microsoft Corporation | Microsoft Windows Application Log |
| DTERMLICENCE file extension | Decimus Software, Inc. | DTerm Licence |
| DTF file extension | IBM | Lotus Domino Server Temporary Format |
| DTH file extension | Microsoft Corporation | Microsoft Windows Application Log |
| DTI file extension | Microsoft Corporation | Microsoft Windows Application Log |
| DTJ file extension | Microsoft Corporation | Microsoft Windows Application Log |
| DTL file extension | Microsoft Corporation | Microsoft Windows Application Log |
| DTPROJ file extension | Microsoft Corporation | SQL Integration Services Project |
| DTT file extension | IBM | IBM AS/400 Data Transfer |
| DT_ file extension | N/A | Apple Macintosh Data Fork Format |
| DUCF file extension | Microcosm Ltd. | DinkeyChange Update Code |
| DUMODULE file extension | Apple, Inc. | Apple Mac OS X Disk Utility Plugin Module |
| DUMP file extension | Google BreakPad Crash Log Format | |
| DUO file extension | Microsoft Corporation | Microsoft Access |
| DUP0 file extension | Samsung Group | Samsung Kies Duplicate Media |
| DUP1 file extension | Samsung Group | Samsung Kies Duplicate Media |
| DUP2 file extension | Samsung Group | Samsung Kies Duplicate Media |
| DUS file extension | N/A | Readiris Font Dictionary Format |
| DVDFAB6 file extension | Fengtao Software Inc. | DVDFab Key |
| DVDFABHDDECRYPTER file extension | Fengtao Software Inc. | DVDFab HD Decrypter |
| DVDRIP-INFO file extension | dvd::rip team | Dvd::rip Technical Information |
| DVS file extension | Symantec Corporation | Enterprise Vault DVS |
| DVTPLUGIN file extension | Apple, Inc. | Apple Xcode DVT Extension |
| DVZ file extension | DataViz Inc. | Documents To Go Data |
| DW1 file extension | Matthew Walker | DeathWatch WebCrawler |
| DW2 file extension | Matthew Walker | DeathWatch WebCrawler |
| DW3 file extension | Matthew Walker | DeathWatch WebCrawler |
| DWC file extension | Emulex | Emulex DWC Firmware Update File Format |
| DWE file extension | N/A | Creator Simulator Pattern |
| DWL file extension | IMSI | AutoCAD Drawing Database Format Locking Information Format |
| DWLIBRARY file extension | Mariner Software | Mariner Paperless Document Library Format |
| DWN file extension | N/A | Firmware Update Format |
| DWO file extension | N/A | Red Hat Linux DWARF Debugging Information |
| DWPROJ file extension | Sybase Inc. | DataWindow Designer Project |
| DWX file extension | Capilano Computing Systems Ltd. | DesignWorks Viewer Tools |
| DX2 file extension | Oracle Corporation | Oracle Siebel |
| DXG file extension | Duxbury Systems, Inc. | Duxbury Braille Translator |
| DXI file extension | ZPAY Payroll Systems, Inc. | PayWindow Database |
| DXTORYLIC file extension | Dxtory Software | Dxtory Licence |
| DXV file extension | Condrey Corporation | DocXchanger |
| DXZ file extension | N/A | Trojan Backdoor Virus |
| DYN file extension | IBM | Lotus 1-2-3 |
| DYV file extension | N/A | WORM_AUTORUN.DYV Worm |
| DYZ file extension | N/A | Backdoor.Win32.ProRat.dyz Trojan |
| DZL file extension | Dazzler Soft | DazzlerMAX |
| E2E file extension | Microsoft Corporation | Microsoft BizTalk RFID Log |
| E2P file extension | Lanconelli Open Systems | PonyProg Device |
| E32 file extension | Jordan Russell | Inno Setup 1.3 |
| E3P file extension | Zuken | E3.series Part |
| E50 file extension | US Army Corps of Engineers | MicroPAVER 5.0 |
| E60 file extension | US Army Corps of Engineers | MicroPAVER 6.0 |
| EAC file extension | Emurasoft | EmEditor Auto Completion |
| EAL file extension | Brayden Automation Corporation | EnergyAccess Log |
| EAZ file extension | ESRI | ArcGIS Explorer Add-in Format |
| EBC file extension | N/A | CITE Control |
| EBF file extension | Microsoft Corporation | Pocket PC WindowsCE Form |
| EBK file extension | The Internet Marketing Center | EBook Pro E-book Format |
| EBKTML file extension | Internet Marketing Center | EBook Pro Encoded Temporary |
| EBL file extension | Bid Express | Expedite Bid Amendment Library |
| EBN file extension | Philips | Philips GoGear Firmware Update Format |
| EBP file extension | Microsoft Corporation | Pocket PC Windows CE Project |
| EBQ file extension | N/A | CITE Electronic Bill Of Quantities |
| EBW file extension | Encyclopædia Britannica (UK) Limited | Encyclopaedia Britannica |
| EBX file extension | Adobe Systems Incorporated | Adobe Transfer Data |
| EC8 file extension | N/A | Simplazz 1-2-3 Accountant Export |
| ECF file extension | N/A | Microsoft Outlook Add-in Format |
| ECH file extension | SourceForge.net | EasyChem Save |
| ECI file extension | Ettercap Project | Ettercap Info |
| ECLIPSEPRODUCT file extension | The Eclipse Foundation | Eclipse Product Maker |
| ECML file extension | Intuit Inc. | Quickbooks Licence |
| ECT file extension | Microsoft Corporation | Microsoft Visual C++ Exception Console Template |
| ECW2002PUZZLE file extension | Green Eclipse | EclipseCrossword Puzzle |
| ECW2002WORDS file extension | Green Eclipse | EclipseCrossword Word List |
| EDC file extension | Inv Softworks | Kryptel (Lite) Decoder/Encoder Format |
| EDP file extension | National Instruments Corporation | Multisim |
| EDPI file extension | PrestoSoft LLC | ExamDiff Pro Session Fle |
| EDR file extension | BALARAD, s.r.o. | Embird Color Palette |
| EDT file extension | N/A | NEPLAN External Program Import / Export |
| EEF file extension | BALARAD, s.r.o. | Embird Project |
| EEK file extension | Arachne | Arachne Script Format |
| EER file extension | Lahey Computer Systems, Inc. | Lahey Fortran Error |
| EEX file extension | Oracle Corporation | Oracle Discoverer EUL |
| EF2 file extension | Tonec | Internet Download Manager Format |
| EFD file extension | Parallels Holdings Ltd. | Parallels Desktop Related |
| EFG file extension | Gambit Project | Gambit Extensive Game Format |
| EFL file extension | NFB | External Format Language Format |
| EFSLIB file extension | eSignal | ESignal EFS Function Library |
| EFT file extension | MakeMusic, Inc. | Finale Enigma Tansportable |
| EGB file extension | Heaton Research, Inc. | Encog Binary Format |
| EGLIB file extension | Adobe Systems Incorporated | Adobe Edge Animate Symbol Library |
| EGT file extension | N/A | EagleGet Incomplete Download |
| EID file extension | IBM | IBM Voice Type Languages Newuser |
| EIO file extension | DesignBuilder Software Ltd | DesignBuilder EnergyPlus Model Summary Configuration Output |
| EKB file extension | Zak Morris Company, Inc. | VisualTablet Data |
| EKS file extension | Metapraxis | Metapraxis Empower Data |
| ELD file extension | NEPLAN | NEPLAN-DOS Import Or Export |
| ELF9 file extension | Esri | ESRI Floating License |
| ELI file extension | Novarm Limited | DipTrace |
| ELK file extension | Altium Limited. | Altium Designer Linker Error Message |
| ELL file extension | N/A | ATI Radeon Driver |
| ELO file extension | N/A | ELO Data |
| ELT file extension | NEPLAN | NEPLAN Topology |
| ELZ file extension | CPT | Crossword Power Tools Crossword Library |
| EM2 file extension | N/A | Emax II Bank |
| EM4 file extension | Automotive Engine Management | AEM Stinger Engine Management Computer |
| EM8 file extension | Automotive Engine Management | AEM 8860 Engine Management Computer |
| EM9 file extension | Automotive Engine Management | AEM 8860 Engine Management Computer |
| EMAT file extension | N/A | ANSYS Element Matrix |
| EMD1 file extension | Apple, Inc. | Apple GarageBand |
| EMIX file extension | Apple, Inc. | Apple Mail Mailbox Message |
| EMN file extension | Parametric Technology Corporation | Pro/ENGINEER |
| EMSG file extension | KJB Software development | SendSafe E-message |
| ENC file extension | GVOX | Encore Musical Notation File Format |
| ENC2 file extension | Samsung Group | Samsung Galaxy Firmware Update |
| ENF file extension | Thomson Reuters | EndNote Filter Format |
| ENH file extension | School of Aquatic & Fishery Sciences, University of Washington | CRiSP Harvest |
| ENML file extension | Evernote | Evernote For Google Android Note Format |
| ENREF file extension | Evernote Corporation | EverNote Food |
| ENX file extension | IBM | IBM Rational XDE |
| EON file extension | EON Reality, Inc. | EON Studio |
| EOP file extension | EON Reality, Inc. | EON Studio |
| EOX file extension | EON Reality, Inc. | EON Studio |
| EOZ file extension | EON Reality, Inc. | EON Studio |
| EPB file extension | WebWorks | EPublisher |
| EPIM file extension | Astonsoft Ltd. | EssentialPIM Data |
| EPJ file extension | Oracle Corporation | JAVA-clients |
| EPK2 file extension | Psychology Software Tools | E-Prime 2.0 Package Format |
| EPRJ file extension | Elnec s.r.o. | Pg4uw Project |
| EPT file extension | Guzik Technical Enterprise | WITE32 |
| EQB file extension | eSignal | ESignal Quote Board |
| EQD file extension | Cattlesoft, Inc. | EquineMax Data |
| EQN file extension | Corel | Corel WordPerfect Equation Format |
| EQT file extension | ReliaSoft Corporation | ReliaSoft Weibull++ 6 |
| EQU file extension | AstroDigital.Net | AstroDigital.Net Equipment |
| ERC file extension | Living Pages Research GmbH. | Ercato Engine |
| ERI file extension | CA Technologies | AllFusion ERwin Data |
| ERIK file extension | DeLorme | Xmap |
| ERL file extension | nProtect | NProtect GameGuard Log Format |
| ERO file extension | SVIC INDIA e-Learning Company | ELibrary Reader Object |
| ERR file extension | Autodesk | AutoCAD Error Log Format |
| ERT file extension | The 3DO Company | Heroes Of Might And Magic 3 Script |
| ERV file extension | ERDAS, Inc. | ER Mapper ASCII Header |
| ERX file extension | N/A | ER Data Model |
| ER_ file extension | Microsoft Corporation | Microsoft Winhelp Compressed |
| ESC file extension | ARAISA SOFTWARE | PRTWin |
| ESCO file extension | Nokia Corporation | Nokia Lumia Windows Phone 7 Firmware |
| ESCOPY file extension | ES APP Group | ES File Explorer Temporary |
| ESD file extension | Microsoft | Microsoft Windows Electronic Software Download Encrypted Software Format |
| ESE2 file extension | Grass Valley USA, LLC. | Edius Seek Information |
| ESF file extension | IBM | IBM VisualAge Generator External Source |
| ESK file extension | eSignal | ESignal Scan |
| ESL file extension | Intersystem Concepts, Inc. | Everest Authoring System Screen Library |
| ESO file extension | DesignBuilder Software Ltd | DesignBuilder EnergyPlus Output |
| ESV file extension | Morningstar | Principia Stock Research Document |
| ETB2 file extension | Netopia, Inc., a Motorola Company | Timbuktu Pro Resource |
| ETC file extension | DeskSoft | EarthTime |
| ETEX file extension | EpsilonSoft | ETutor Questions |
| ETH file extension | Qualis Research | Ethnograph Data |
| ETK file extension | Orgadata AG | Orgadata LogiKal |
| ETO file extension | Microsoft Corporation | Microsoft Visual Studio Policy Cache |
| ETP file extension | Microsoft Corporation | Visual Studio .NET |
| ETQ file extension | eSignal | ESignal Time And Quotes |
| ETS file extension | eSignal | ESignal Time And Sales |
| ETZ file extension | Bentley Systems, Incorporated | RAM Elements Model |
| EUHL file extension | QUALCOMM Incorporated | Eudora For Mac Help |
| EV3S file extension | N/A | LEGO MINDSTORMS Shared |
| EVC file extension | DeskSoft | Earthview |
| EVE file extension | MIE Software | Summit Event Manager Event Data |
| EVENT file extension | Corel | Corel Catalog Format |
| EVL file extension | Myriax Software Pty Ltd. | EchoView Exported Line |
| EVN file extension | Retrosheet | Retrosheet Event |
| EVS file extension | Nicolaudie | Easy Stand Alone |
| EWC2 file extension | Grass Valley USA, LLC. | EDIUS WaveForm Cache |
| EWD3 file extension | Flexera Software, Inc. | InstallShield |
| EWL file extension | Green Eclipse | EclipseCrossword Word List |
| EWM file extension | EW Avionics | EWView Geographic Data |
| EWSMBOX file extension | Apple, Inc. | Apple Mail |
| EWT file extension | EW Avionics | EWView Trace Data |
| EX3 file extension | N/A | Harvard Graphics Device Driver |
| EXD file extension | Microsoft | Control Information Cache Format |
| EXF file extension | Exactal Pty Ltd. | CostX Data Exchange |
| EXG file extension | LKSoftWare GmbH | JSDAI Express-G Schema |
| EXJ file extension | Oracle Corporation | Java |
| EXT file extension | Symantec | Norton Commander Extension Format |
| EXTRA file extension | Mozilla Firefox Crash Report Format | |
| EXTREP file extension | Sage Project | SAGE External Representation |
| EXV file extension | Adobe Systems | Adobe Extension Script |
| EYB file extension | Microsoft | Microsoft Encarta Encyclopedia Yearbook Update Format |
| EZLOG file extension | Skype | Skype Extras Manager Log Format |
| EZW file extension | Reagency Systems | EasyOFFER Real Estate Form Format |
| F#+A file extension | RagTime GmbH | RagTime Classic |
| F#+D file extension | RagTime GmbH | RagTime Classic |
| F01 file extension | U.S. Army Corps of Engineers | HEC-RAS Flow |
| F02 file extension | U.S. Army Corps of Engineers | HEC-RAS Flow |
| F04 file extension | U.S. Army Corps of Engineers | HEC-RAS Flow |
| F05 file extension | U.S. Army Corps of Engineers | HEC-RAS Flow |
| F2F file extension | Byteworx | Byteworx FMEA Exported Data |
| FAD file extension | Microsoft Corporation | Office Attribute Database |
| FAE file extension | Microsoft Corporation | MS Office 97 Converter DLL |
| FAG file extension | N/A | Win32.AutoRun.fag |
| FAVORITE file extension | Apple, Inc. | Apple IDVD Favorite |
| FB! file extension | FlashGet | FlashGet Incomplete Download |
| FBD file extension | BMC Software, Inc. | Remedy Change Management Flashboard |
| FBG file extension | Advanced Geo Positioning Solutions, Inc. | Shape Pro Ground Surface |
| FBND file extension | Apple, Inc. | Apple Communication Tool |
| FBPROJ file extension | Mediaparts Interactive | FlippingBook Photo Album Project |
| FBS file extension | Builders Exchange of Washington, Inc. | Fastbid |
| FBV file extension | VSoft Technologies Pty Ltd | FinalBuilder Persistent Variables |
| FCA file extension | TigerLogic Corp. (Omnis Technology Corporation) | Omnis Web Client |
| FCB file extension | Fonix Corporation | FAAST Builder |
| FCHC file extension | Fetch Softworks | Fetch Cache |
| FCHK file extension | Gaussian, Inc. | Gaussian Checkpoint |
| FCOD file extension | Adobe Systems Incorporated | Adobe PageMaker Filter |
| FCPA file extension | Michigan Department of Community Health | Officer Cost Report Data |
| FCPR file extension | Michigan Department of Community Health | Officer Cost Report Data |
| FCR file extension | Michigan Department of Community Health | Cost Report Data |
| FCXR file extension | SPIRIT | FileCapsule Deluxe |
| FCXU file extension | SPIRIT | FileCapsule Deluxe |
| FD1 file extension | Microsoft Corporation | Windows Live Photo Gallery Thumbnail Database |
| FDE file extension | Ternion Corporation | FLAMES Dataset Export |
| FDK file extension | Fluentizer LLC | Fluentizer Fluent Dictionary |
| FDLANG4 file extension | NewsGator Technologies, Inc. | FeedDemon Language Resource |
| FDPART file extension | Freshdevices Corp. | Fresh Download Partial Downloaded |
| FDRTEMPLATES file extension | AGS Technik | FDRTools Template |
| FDSEQ file extension | Dolphin Futures Limited | XPS Document Related Data |
| FDSRCH2 file extension | NewsGator Technologies, Inc. | FeedDemon Search Data |
| FDU file extension | Software AG | Natural Security |
| FDXSL4 file extension | NewsGator Technologies, Inc. | FeedDemon Newspaper Style |
| FED file extension | Rastislav KORYTAR | FORMIK Form Data |
| FEEDBACK file extension | Microsoft | Expression SketchFlow Feedback Format |
| FEM file extension | DHI-WASY GMBH | FEFLOW FEM Problem |
| FET file extension | N/A | Free Timetabling Software |
| FEX file extension | Information Builders | WebFOCUS FOCUS Web390 Procedure |
| FF2 file extension | AceBIT GmbH | Hello Engines! |
| FFINDEX file extension | N/A | FFmpegSource2 Media Index |
| FFU file extension | Microsoft Corporation | Windows Phone Full Flash Update |
| FGDB file extension | FontLab Ltd. | Fontographer Mac |
| FGF file extension | N/A | Nav.Net NG Fusker Generator |
| FGT file extension | SourceForge.net | FreeGantt Skeleton |
| FH40 file extension | Adobe Systems Incorporated | Adobe FreeHand For Mac |
| FHA3 file extension | Adobe Systems Incorporated | Adobe Freehand For Mac |
| FHD3 file extension | N/A | FreeHand |
| FHM file extension | ASIP Solutions, Inc. | ASIP Meister |
| FIB file extension | Forensic Innovations, Inc. | File Investigator |
| FIFF file extension | N/A | Elekta Neuromag Data |
| FILE file extension | N/A | Generic Windows Format |
| FILELOC file extension | Apple, Inc. | Apple Mac OS X Finder Internet Location |
| FILEPART file extension | N/A | WinSCP Temporary Download |
| FILE_CRCS file extension | Electronic Arts, Inc. | Electronic Arts Origin Client |
| FIM file extension | Mystic Fractal | Fractal Imaginator Data/Parameter |
| FIN file extension | Dassault Systèmes S.A. | ABAQUS |
| FIO file extension | Ulead Systems | Aldus PhotoStyler Graphics Filter |
| FIR file extension | Pyrotechnics Management, Inc. | FireOne Fireworks Show |
| FIV file extension | Forensic Innovations, Inc. | File Investigator |
| FJL file extension | N/A | Rootkit.Win32.Agent.fjl Virus |
| FJSW file extension | Hermitech Laboratory | Formulator Tarsia Jigsaw |
| FKC file extension | Softland | FBackup Catalog |
| FKD file extension | LANSRAD | FotoKiss Photo Set Data |
| FKT file extension | KDE e.V | KmPlot Data |
| FL3 file extension | Adobe Systems | Flash 3D Format |
| FLF file extension | Microsoft | Microsoft Dynamics NAV License Format |
| FLM file extension | Microsoft Corporation | Visual FoxPro Library |
| FLT file extension | N/A | Filter Format |
| FLW file extension | Xilinx, Inc. | Xilinx Flow |
| FLY file extension | Sierra Vista Software | Quiz-Buddy Quiz Data |
| FLZ file extension | CyberLink Corp. | MediaShow Data |
| FMC file extension | Cobus | NCAD |
| FMD file extension | Microsoft Corporation | Microsoft Access |
| FMELIC file extension | Safe Software | FME License Format |
| FMK file extension | GFI Software | FaxMaker |
| FMK$ file extension | FileMaker, Inc. | FileMaker For Mac |
| FMO file extension | dataBased Intelligence, Inc. | DBASE IV Compiled Format |
| FMPLUGIN file extension | FileMaker | FileMaker Pro Plug-in Format |
| FMPP file extension | Ternion Corporation | FLAMES Model Prototype |
| FMR file extension | Parametric Technology Corporation | Pro/ENGINEER |
| FMS file extension | IBM | Lotus Freelance Graphics |
| FMTR file extension | FileMaker, Inc. | FileMaker Transfer |
| FMX file extension | N/A | FileMaker Plug-in Format |
| FMXLIST file extension | Safe Software Inc. | FME Transformer List Format |
| FMXT file extension | FileMaker, Inc. | FileMaker Pro Mac |
| FNA file extension | University of Virginia | FASTA DNA And Protein Sequence Alignment |
| FND file extension | Microsoft | Microsoft Windows Explorer Saved Search Format |
| FNDR file extension | DeLorme | Xmap For Mac |
| FNET file extension | FileMaker, Inc. | FileMaker Network |
| FNI file extension | IBM | FileNet IDM Viewer |
| FNL file extension | Microsoft Corporation | Microsoft Live Mesh |
| FNLF file extension | Focusrite | Scarlett Plug-in Suite License Format |
| FNM file extension | Apache Software Foundation | Apache Lucene Field |
| FNO file extension | Atlast! Solutions | Atlast File Notes Organizer CSV Data |
| FNR file extension | N/A | Trojan-Dropper.Win32.Flystud.lc. |
| FNS file extension | Apple, Inc. | Apple FontSyncScripting Font Profile |
| FNSP file extension | Apple, Inc. | Apple FontSync Scripting |
| FOD file extension | EZ-Forms Company | EZ-Forms ULTRA |
| FOF file extension | EZ-Forms Company | EZ-Forms Filled Out Form |
| FOG4 file extension | FontLab Ltd. | Fontographer 4 |
| FOM file extension | EZ-Forms Company | EZ-Forms Fill Out Master Form |
| FOUNDFILES file extension | Apple, Inc. | Mac OS X |
| FOV file extension | N/A | MORSE Field Of View |
| FPC file extension | Microsoft Corporation | FoxPro Catalog |
| FPFV file extension | Intermedia | File Protected From Virus |
| FPK file extension | N/A | JetForm Form Package File (FormFlow) |
| FPL file extension | ABACOM | FrontDesigner Front Panel |
| FPR file extension | N/A | Fruitypro Samples Humanize Presets Grooves |
| FQF file extension | iniCom Networks Inc. | FlashFXP Queue |
| FR4 file extension | Sirotinsky Arthur and Olga Fedorenko | Fractal Explorer Quaternion Spots In Internal Parametrical Format |
| FRA file extension | Sirotinsky Arthur and Olga Fedorenko | Fractal Explorer Animation Of Fractal Navigation Project |
| FRAM file extension | Adobe Systems Incorporated | Adobe FrameMaker |
| FREELIST file extension | Esri | ArcGIS |
| FRELF file extension | ABBYY | Abbyy FineReader Engine License |
| FREQ file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Frequency Model |
| FRESHCONTACT file extension | NAVIGON AG | NAVIGON MobileNavigator Navigation |
| FRI file extension | Sirotinsky Arthur and Olga Fedorenko | Fractal Explorer IFS Spot In Internal Parametrical Format |
| FRK file extension | N/A | Apple Macintosh Resource Or Data Fork |
| FRM file extension | N/A | Form Format |
| FRP file extension | Delrina | PerForm Or FormFlow Form |
| FRQ file extension | Olle Persson | Bibexcel |
| FRV file extension | Microsoft Corporation | Microsoft FRx |
| FRZ file extension | N/A | Locked FormFlow Format |
| FS file extension | Apple | Mac OS X Format System Plug-in Format |
| FSEVENTSD-UUID file extension | N/A | Fseventsd |
| FSF file extension | Microsoft Corporation | Microsoft Office Cache |
| FSN file extension | Nova Development Corporation | Greeting Card Factory Greeting Card |
| FSO file extension | Adobe Systems Incorporated | Adobe Flash Media Server File System Object |
| FSP file extension | N/A | Fsplit Split |
| FSR file extension | N/A | File Substring Replacement Utility |
| FT30 file extension | Adobe Systems Incorporated | Adobe PageMaker For Mac Filter |
| FTB file extension | Ancestry.com Inc. | Family Tree Maker Genealogy |
| FTCH file extension | Fetch Softworks | Fetch |
| FTD file extension | RHDC Services Ltd | FFT Designer Project |
| FTF file extension | N/A | Sony Ericsson Xperia Android Firmware |
| FTIL file extension | FTIL | E-Hastakshar Contract Note Format |
| FTK file extension | N/A | Forensic Toolkit |
| FTPLOC file extension | N/A | Apple Mac OS X Finder FTP Location Format |
| FTR file extension | Silicon Graphics, Inc. | IRIX |
| FTV file extension | CA Technologies | CA CleverPath Forest & Trees |
| FUD file extension | N/A | FairUse Wizard Data |
| FUJ file extension | N/A | Worm.Win32.AutoRun.fuj Virus |
| FUN file extension | Lucky Monkey Design LCC | Koolmoves |
| FUSE_HIDDEN file extension | The Samba Team | Samba |
| FV file extension | Freshdevices.com | Fresh View Thumbnail Cache |
| FVP file extension | ANSYS Inc. | FLUENT Path Line |
| FVU file extension | National Securities Depository Limited | File Validation Utility Input |
| FW file extension | N/A | Kodak Camera Firmware Format |
| FW4 file extension | Selections & Functions, Inc. | Framework IV |
| FWD file extension | Ipswiitch,Inc. | Imail Server Forwarded Mail |
| FWS file extension | CursorArts Company | FileWrangler Data File For File Splitting Configuration |
| FXB file extension | Steinberg | Steinberg VST Audio Plug-in Format |
| FXD file extension | Microsoft Corporation | FoxPro FoxDoc Support |
| FXI file extension | Cottonwood Software | File-Ex Data |
| FXO file extension | Valve Corporation | Steam Client Shader |
| FXP file extension | Steinberg Media Technologies | VST Audio Extension |
| FXT file extension | N/A | Finale Plug-in Format |
| FXW file extension | eSignal | ESignal |
| FYC file extension | eSignal | ESignal |
| FYI file extension | Flow-Cal, Inc. | FLOWCAL Desktop |
| FZD file extension | Efzed Pty. Ltd. | AIRLINE City Data |
| FZIP file extension | Foxit | Foxit Reader Add-on Format |
| FZP file extension | AutoDesSys | Form•Z Extension |
| FZY file extension | LexisNexis | LexisNexis Concordance Fuzzy |
| G03 file extension | U.S. Army Corps of Engineers | HEC-RAS Geometry |
| G3A file extension | Casio | Casio Prizm Program Format |
| GAB file extension | Dencom | Dencom Global Address Book Export |
| GAC file extension | Microsoft Corporation | Groove |
| GAD file extension | Math2Market GmbH | Geodict |
| GAI file extension | Adobe Systems Incorporated | Adobe SING Glyphlet Manager |
| GAP file extension | Ulead Systems | PhotoImpact Pencil Style |
| GAS file extension | Blue Squirrel | Grab-a-Site Project |
| GAU file extension | Microsoft | Microsoft Flight Simulator Gauge Format |
| GBD file extension | Great Budget Software | Great Budget Budget Definition |
| GBF file extension | Great Budget Software | Great Budget Fringe Definition |
| GBT file extension | Adobe Systems Incorporated | Adobe Photoshop Format |
| GCA4PARTY file extension | Steve Jackson Games | GURPS Character Assistant |
| GCCV file extension | Adobe Systems Incorporated | PageMaker Filter |
| GCDA file extension | Free Software Foundation, Inc. | GCC Gcov Profiling |
| GCNO file extension | Free Software Foundation, Inc. | GCC Gcov Profiling |
| GDC file extension | SmartWare Corporation | SmartWare Composite Graph |
| GDE file extension | GlobalQSL | GlobalQSL Graphic Editor |
| GDH file extension | SmartWare Corporation | SmartWare High-low Graph |
| GDI file extension | Various Linux developers | Generic Download Install |
| GDL file extension | Graphisoft | ArchiCAD Geometric Description Language Data |
| GDP file extension | Benjamin Marty | Scrolling Game Development Kit Project |
| GDQ file extension | SmartWare Corporation | SmartWare Quick Graph |
| GDSP file extension | Gold Disk Inc. | Astound |
| GDV file extension | SmartWare Corporation | SmartWare Graphics Screen Driver |
| GDX file extension | GAMS Development Corporation | GAMS Result |
| GDYN file extension | N/A | GIMP Pressure Curves Output |
| GDZ file extension | Thoughtful Creations | Genbox Family History Data Initialization |
| GE6 file extension | N/A | WinFamily 6 Genealogy |
| GEB file extension | Peter Gebhard | Dr. Hardware |
| GEP file extension | Gepsoft Ltd. | GeneXproTools Data |
| GER file extension | Parametric Technology Corporation | Pro/ENGINEER Temporary |
| GFD file extension | Gadwin Systems, Inc. | GeForms |
| GFF file extension | Roche NimbleGen, Inc. | SignalMap Gene-Finding Format (GFF) Data |
| GFL file extension | Gadwin Systems, Inc. | GeForms |
| GFS file extension | Microsoft Corporation | Microsoft SharePoint WorkSpace Groove Remote |
| GFT file extension | Gadwin Systems, Inc. | GeForms Form Template |
| GFX file extension | ClickTeam | The Games Factory |
| GG file extension | Google Desktop Gadget Format | |
| GGD file extension | CERC | GASTAR Output |
| GGG file extension | Sharon Dugdale & David Kibbey | Green Globs & Graphing Equations Game Record |
| GGI file extension | The GGI Project | GGI |
| GGM file extension | Sharon Dugdale & David Kibbey | Green Globs & Graphing Equations Saved State |
| GHT file extension | Symantec Corporation | Ghost Project |
| GITKEEP file extension | N/A | Gitkeep |
| GJF file extension | Gaussian, Inc. | Gaussian Input Data |
| GKF file extension | Aptech Systems, Inc | GAUSS Engine License |
| GKP file extension | Locnet | GameKeyboard |
| GLAD file extension | Broad Institute | GenePattern GLAD |
| GLINK file extension | Link To Third-party Google Drive Web Application Document | |
| GLK file extension | Microsoft Corporation | Microsoft SharePoint WorkSpace Groove Shortcut |
| GLL file extension | AFMG Technologies GmbH | EASE SpeakerLab Compiled Text |
| GLM file extension | Rainer Goebel | BrainVoyager QX GLM Analysis Result |
| GLOS file extension | Microsoft Corporation | Microsoft Word For Mac Glossary |
| GLP file extension | EIVA a/s | NaviEdit Geoconsult Long Profile |
| GLU file extension | Cyberglue | Cyberglue |
| GLUT file extension | SGI | OpenGL GLUT |
| GLUT2 file extension | Silicon Graphics, Inc. | OpenGL Glut-3.6 |
| GLUT3 file extension | SGI | OpenGL GLUT |
| GLX file extension | Pasco | DataStudio Experiment |
| GLY file extension | Microsoft | Microsoft Word Glossary Format |
| GLZ file extension | CPT | Crossword Power Tools Crossword Library |
| GM1 file extension | Sharp Electronics Corp. | Sharp Advanced Presentation Software Professional |
| GM4 file extension | Sharp Electronics Corp. | S.A.P.S. |
| GMZ file extension | YoYo Games | GameMaker Complete Source |
| GNS file extension | Sound Health Options | Sound Health Abacus Genesis |
| GO! file extension | Headlight Software, Inc. | Go!Zilla Unfinished Download |
| GOA file extension | N/A | SpiceCAD |
| GOD file extension | Synbioz | God Configuration Format |
| GOLD file extension | The GNOME Project | Gnome Desktop |
| GOX file extension | ClickTeam | The Games Factory Extension |
| GP file extension | Arobas Music | Guitar Pro |
| GP4 file extension | Arobas Music | Guitar Pro 4 Project Format |
| GPC file extension | Genie-Soft Corporation | Genie Backup Manager Plugin |
| GPG file extension | Free Software Foundation | GNU Privacy Guard Public Keyring Format |
| GPH file extension | Parametric Technology Corporation | Pro/ENGINEER |
| GPRJ file extension | Gearotic | Gearotic Motion Project |
| GPZ file extension | IBM | IBM DB2 Document Manager Document History |
| GR4 file extension | Contract Telecommunication Engineering Ltd. | Pathloss Sharing |
| GRADS file extension | Jörg Wegner | PINGO GrADS Data |
| GRBDROPFILE file extension | Headlight Software, Inc. | GetRight |
| GRC file extension | Affymetrix, Inc. | Affymetrix Grid Control |
| GRDECL file extension | The Eclipse Foundation | Eclipse Specific |
| GRI file extension | Petrosys Pty Ltd | Petrosys Grid |
| GRM file extension | Stanford Business Software, Inc | MINOS |
| GROUPS file extension | WebMoney | WM Keeper CLASSIC Group |
| GROWLREGDICT file extension | Growl | Growl Temp Format |
| GROWLVIEW file extension | Growl Team | Growl Display Plugin |
| GRW file extension | Naviter d.o.o. | SeeYou Waypoint |
| GS1 file extension | Bloodlust Software | Genecyst Save State 1 |
| GSA file extension | GeneStudio, Inc. | GeneStudio Alignment |
| GSDU file extension | InsaneMatt | GameSave Manager Database Update |
| GSE file extension | Psytech International | GeneSys Export |
| GSF file extension | N/A | Multi Game Memory Editor Date |
| GSL file extension | Siber Systems, Inc. | GoodSync Job List |
| GSP file extension | Key Curriculum Press | Geometers Sketchpad Material Format |
| GSS file extension | N/A | Multi Game Memory Editor Memory Snapshot |
| GSVR file extension | Artifex Software | GhostScript |
| GSZ file extension | GEO-SLOPE International Ltd. | GeoStudio Project |
| GT2 file extension | SourceForge.net | Graoumf Tracker Music Module (MOD) |
| GTA file extension | Microsoft | Microsoft SharePoint WorkSpace Groove Tool Archive Format |
| GTH file extension | Olle Persson | Bibexcel |
| GTI file extension | Georgia Tech Research Corporation | STRUDL Input |
| GTO file extension | Intuit Inc. | Quicken Online Data |
| GW file extension | Grassland, Soil & Water Research Laboratory | SWAT Groundwater Input |
| GWF file extension | Benthic Software | Benthic Golden |
| GWL file extension | N/A | Nanoscribe General Writing Language |
| GWT file extension | N/A | SpaceStat Generalized Weights Format |
| GX2 file extension | N/A | Generic Cadd |
| GXR file extension | Artech Consultores S.R.L. | GeneXus Report |
| GZ1 file extension | Orgadata AG | Orgadata LogiKal |
| GZF file extension | MaximumSoft Corp. | Webcopier |
| GZL file extension | Headlight Software, Inc. | Go!Zillalist |
| GZQUAR file extension | Softwin | BitDefender Quarantine |
| H00 file extension | ARM Holdings plc | ARM EPROM HEX |
| H01 file extension | ARM Holdings plc | ARM EPROM HEX |
| H04 file extension | General Electric Company | GE FIX32 Historical |
| H08 file extension | General Electric Company | GE FIX32 Historical |
| H1D file extension | N/A | Microsoft Windows |
| H1H file extension | Microsoft Corporation | Microsoft Windows Merged Hierarchy Help |
| H1Q file extension | Microsoft | Microsoft Help Merged Query Index Format |
| H1W file extension | Microsoft Corporation | Microsoft Windows Keyword Index |
| H2DRUMKIT file extension | Hydrogen Team | Hydrogen Drum Kit |
| H2W file extension | N/A | H2testw |
| H3B file extension | Line 6, Inc. | POD HD300 Bundle |
| H4B file extension | Line 6, Inc. | POD HD400 Bundle |
| H5 file extension | N/A | Hierarchical Data Format Version 5 |
| HANG file extension | Apple, Inc. | Apple Mac OS X Terminal |
| HAR file extension | Rick Meyers | E-Sword Harmony Resource |
| HARX file extension | Rick Meyers | E-sword Harmony |
| HASH file extension | Guidance Software Inc. | EnCase Forensic Drive Image Hash |
| HBN file extension | Oracle Corporation | Java Hibernate |
| HCS file extension | Health Canada | NHP ESubmission Builder Submission Package |
| HCT file extension | Symantec Corporation | Symantec Liveupdate |
| HDF4 file extension | The HDF Group | HDF4 |
| HDF5 file extension | The HDF Group | HDF5 |
| HDK file extension | HotDocs | HotDocs Registration Format |
| HDX file extension | Autodesk | Delphi MultiHelp Index Format |
| HE4 file extension | The HDF Group | HDF4 |
| HED file extension | ReliaSoft Corporation | ReliaSoft RG |
| HEF file extension | FrontRange Solutions USA Inc. | HEAT Export |
| HELPINDEX file extension | Mariner Software, Inc. | Mariner Software Narrator Index |
| HEP file extension | Novell, Inc. | Novell NetWare Help Librarian Data |
| HET file extension | SYNAMETIRCS | WinSQL HTML Export Template |
| HEU file extension | Adobe Systems Incorporated | Adobe Flash Player Cache Metadata |
| HEX file extension | N/A | Hex Dump Format |
| HFA file extension | ERDAS, Inc. | Erdas Imagine Hierarchical |
| HFO file extension | Avid Technology, Inc. | Pinnacle Hollywood FX Object |
| HFP file extension | N/A | XnView Filter |
| HFSS file extension | Ansoft | Ansoft HFSS Project |
| HFX file extension | Harvard Graphics | Harvard Graphics F/X |
| HHL file extension | Microsoft Corporation | Visual Basic |
| HHPACK file extension | Stealth | HTC Home Extension |
| HHS file extension | N/A | Oracle HyperHub Subkit |
| HIN file extension | Hypercube, Inc. | HyperChem HIN Chemical Modeller Input |
| HISF file extension | CSE | DL_POLY History |
| HISU file extension | CSE | DL_POLY History |
| HKC file extension | HTML-Kit.com | HTML-KIT Auto Complete Short Cut |
| HKF file extension | Microsoft Corporation | Microsoft.NET Framework |
| HKL file extension | N/A | RMCProfile Range Of Values |
| HKS file extension | HTML-Kit.com | HTML-KIT Plugin |
| HL6 file extension | WellSight Systems Inc. | Horizontal.Log 6 |
| HLB file extension | N/A | VAX VMS Help Library Format |
| HLC file extension | European Southern Observatory | ESO MIDAS Help Command |
| HLD file extension | Structural Desktop, Inc. | Structural Desktop Hold |
| HLOG file extension | VMware, Inc. | VMware Workstation Log |
| HLQ file extension | European Southern Observatory | ESO MIDAS Help Qualifier |
| HLT file extension | N/A | Watcher Database Trades List |
| HLW file extension | N/A | Win32/AMalum.EDHZ |
| HLX file extension | N/A | ATI Radeon Video Driver Format |
| HLZ file extension | European Southern Observatory | ESO MIDAS Help ASCII |
| HM file extension | Microsoft Corporation | Windows Help Context IDs |
| HM0 file extension | MAGIX AG | MAGIX Audio Cleaning Lab Waveform |
| HM3 file extension | N/A | Help & Manual Help File Project |
| HMAP file extension | N/A | Microsoft SharePoint Server 2007 Temporary |
| HMAPDIR file extension | N/A | Microsoft SharePoint Server 2007 Temporary |
| HMD file extension | Grassland, Soil & Water Research Laboratory | SWAT Relative Humidity Input |
| HMF file extension | Tech Soft 3D | HOOPS Metafile |
| HMGD file extension | N/A | Microsoft Grammar |
| HMHD file extension | Microsoft Corporation | Word Hyphenation Format |
| HMMER file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM HMMER Format |
| HMMR file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM HMMR |
| HMSD file extension | N/A | Microsoft Dictionary |
| HMX file extension | N/A | Help & Manual Help File Project |
| HMY file extension | Altuit, Inc. | Hemingway Content Management System Plugin |
| HPC file extension | Microsoft Corporation | HP Font Language |
| HPLG file extension | Apple, Inc. | Apple ITunes Device Plugin |
| HPM file extension | Symantec Corporation | Procomm Plus Alternate Main Menu |
| HPRJ file extension | proDAD Inc. | Heroglyph Project |
| HPROF file extension | N/A | Java Heap Dump |
| HPS file extension | HP | Hewlett-Packard Web PrintSmart Format |
| HRD file extension | MSC Software Corporation | MSC Patran Device-dependent Hardcopy |
| HRM file extension | Polar Electro | Polar ProTrainer Pulse Rate Save |
| HRS file extension | Wagers & Associates, Inc. | Holder Reporting System |
| HRU file extension | Grassland, Soil & Water Research Laboratory | SWAT HRU Input |
| HRX file extension | Herolab GmbH | Herolab EasyWin32 |
| HS file extension | Motorola | Motorola Flash Flex Format |
| HSP file extension | HeliumScraper.com | Helium Scraper Project |
| HSR file extension | HS-Soft | RezeptAssist Import Or Export |
| HSS file extension | Adobe Systems Incorporated | Adobe Dreamweaver Snippet |
| HSX file extension | HBXL Construction Software | Health & Safety Xpert Project |
| HT1 file extension | Google Inc. | Google Desktop Application Data |
| HTI file extension | Microsoft Corporation | Microsoft Windows WinHelp Related |
| HUD file extension | SmartWare Corporation | SmartWare Dictionary |
| HUS file extension | Viking | Husqvarna Embroidery Format |
| HVIF file extension | Haiku, Inc. | Haiku Vector Icon Format |
| HVPL file extension | Apple | Apple ITunes Visual Plugin Format |
| HWL file extension | Corel Corporation | Corel WordPerfect Shared Writing Tools 9.0 |
| HWOF file extension | Microsoft Corporation | Microsoft Office For Mac Help |
| HWX file extension | Rockwell Automation, Inc. | RSNetWorx Registration |
| HXA file extension | Microsoft | Microsoft Help Attribute Definition Format |
| HXC file extension | Microsoft | Microsoft Visual Studio Collection Definition Format |
| HXD file extension | Microsoft Corporation | Microsoft Help Validator |
| HXE file extension | Microsoft | Microsoft Help 2 Sample Definition Format |
| HXF file extension | Microsoft Corporation | Microsoft Help Include |
| HXH file extension | Microsoft Corporation | Microsoft Help Merged Hierarchy |
| HXK file extension | Microsoft | Microsoft Help 2 Keyword Index Format |
| HXL file extension | Microsoft Corporation | Microsoft Help Registered Namespace List |
| HXR file extension | Microsoft Corporation | Microsoft Help Data |
| HXT file extension | Microsoft | Help Table Of Contents Format |
| HY1 file extension | Corel Corporation | Ventura Publisher Hyphenation Algorithm |
| HY2 file extension | Corel Corporation | Ventura Publisher Hyphenation Algorithms |
| HYC file extension | Corel Corporation | Corel WordPerfect Data |
| HYD file extension | Corel Corporation | Corel WordPerfect Hyphenation Dictionary |
| HYP file extension | Adobe Systems | Adobe Acrobat Dictionary Format |
| HYQ file extension | SINTEF | CARE-S InfoWorks Hydrograph |
| HZD file extension | Halliburton | SeisWorks |
| H_ file extension | Microsoft Corporation | Microsoft Winhelp Compressed |
| I1C file extension | IBM | IBM Voice Type Languages Newuser |
| I1I file extension | IBM | IBM Voice Type Languages Newuser |
| I2C file extension | IBM | IBM Voice Type Languages Newuser |
| I2I file extension | IBM | IBM Voice Type Languages Newuser |
| I32 file extension | National Instruments Corporation | NI LabView |
| I3C file extension | IBM | IBM Voice Type Languages Newuser |
| I3I file extension | IBM | IBM Voice Type Languages Newuser |
| I64 file extension | Hex-Rays SA | Interactive Disassembler |
| IA1 file extension | Kuta Software LCC | Infinite Algebra 1 |
| IA2 file extension | Kuta Software LCC | Infinite Algebra Assignment |
| IAD file extension | Symantec Corporation | Symantec Patch Management |
| IAK file extension | IDEAlliance | MAIL.DAT Information Access Key |
| IAL file extension | Microsoft Corporation | Microsoft SharePoint List Activity |
| IAR file extension | Krzysztof Wojtas | CD Katalog |
| IBANK file extension | IGG Software, LLC | IBank Accounting Data |
| IBG file extension | i2 | IBridge Project Workspace |
| IBK file extension | N/A | Kodak Imaging For Windows Bookmark |
| IBL file extension | PageTech | PCLTool Index Location |
| IBN file extension | Rohde & Schwarz | WinIQSIM |
| IBPLUGIN file extension | Apple | Interface Builder Extension |
| IBS file extension | i2 Limited | I2 IBase |
| IBV file extension | N/A | IGOR Pro Binary Variable |
| IBW file extension | N/A | IGOR Pro Binary Wave |
| IBX file extension | Interscope s.r.l. | Interscope BlackBox |
| IBY file extension | N/A | Symbian ROM Image Component Include |
| IC file extension | National Instruments Corporation | SPICE Initial Condition |
| IC0 file extension | Synopsys, Inc. | HSPICE Output |
| IC4 file extension | Prism Media Products Limited | SADiE Interchange Data |
| ICAL file extension | N/A | ICalendar Format |
| ICALENDAR file extension | N/A | ICalendar Format |
| ICHATTRANSFER file extension | Apple, Inc. | Apple IChat Transfer |
| ICI file extension | Semichem, Inc. | Ampac |
| ICMA file extension | Adobe Systems | Adobe InDesign Format |
| ICMS file extension | RagTime GmbH | RagTime Extensions |
| ICONBOX file extension | ChickenByte | IconBox |
| ICONBOXICON file extension | ChickenByte | IconBox |
| ICONTAINER file extension | Panic | Icon Container Library Format |
| ICQ file extension | ICQ LLC | ICQ Archive |
| ICX file extension | Microsoft Corporation | Remote Call Profiler Summary View |
| ICXS file extension | Apple, Inc. | ITunes |
| ICZ file extension | N/A | Lib2Def Output |
| ID file extension | IBM | IBM Lotus Notes ID Format |
| ID3 file extension | Michal L. Wright | IData 3 Data |
| IDA file extension | Microsoft Corporation | Microsoft IIS Server |
| IDATA file extension | Michal L. Wright | IData 2 Data |
| IDEMO file extension | NetPlay Software | InstantDemo Project |
| IDENTCACHE file extension | Embarcadero Technologies, Inc. | Delphi Temporary Cache |
| IDH file extension | SourceForge.net | OpenCBM |
| IDI file extension | Siemens Product Lifecycle Management Software Inc. | I-deas Web Access |
| IDIF file extension | AOL Inc. | Netscape Saved Address Book Identification |
| IDLK file extension | Adobe Systems | Adobe InDesign Lock Format |
| IDLL file extension | Freescale Semiconductor, Inc. | CodeWarrior DLL |
| IDM file extension | Ulead Systems | Ulead Photo Express Messages |
| IDP file extension | IBM | IBM Personal Communications Interchange Document Profile |
| IDQ file extension | Microsoft Corporation | Microsoft Internet Explorer Data Query |
| IDX file extension | N/A | Index Format |
| IDZ file extension | Siemens Product Lifecycle Management Software Inc. | I-DEAS Web Access |
| IEC file extension | N/A | Microsoft HTML Converter |
| IEI file extension | FMJ-Software | Image Eye Thumbnail Cache |
| IEL file extension | wondertouch, LLC | ParticleIllusion SE Emitter Library |
| IENV file extension | Michal L. Wright | IData 3 Envelope Template |
| IFB file extension | Infotriever, Inc. | Infotriever Extension |
| IFL file extension | Autodesk | 3D Studio Max Animation Format List Control Format |
| IFM file extension | Brighterion | Brighterion IPrevent Fraud Model |
| IFN file extension | N/A | IGOR Pro Formatted Notebook |
| IFT file extension | N/A | IGOR Pro Formatted Notebook Template |
| IFX file extension | IBM | Rational XDE |
| IHC file extension | General Electric Company | Proficy Historian |
| IHF file extension | N/A | IGOR Pro Help |
| IHS file extension | RAD Game Tools, Inc. | Bink Inbound History |
| IID file extension | i-Installer Team | IInstaller Idirectory |
| III file extension | Insurance Information Institute, Inc. | Know Your Stuff |
| IIX file extension | SDL | Trados Translation Memory Index Format |
| IL file extension | André Luiz Barbosa | SimuPLC Electric Commands Language Instruction List |
| IL3 file extension | wondertouch, LLC | ParticleIllusion 3 Emitter Library |
| ILABEL file extension | Michal L. Wright | IData 3 Template Label |
| ILB file extension | Psi | Scream Tracker Data |
| ILF file extension | Islamic Goods Direct | Alim |
| ILG file extension | Pehong Chen | MakeIndex Error Log |
| ILOCK file extension | Michal L. Wright | IData |
| ILP file extension | Gurobi Optimization, Inc. | Gurobi Optimizer Temporary |
| ILS file extension | Microsoft Corporation | Internet Security And Acceleration Server Summary |
| ILX file extension | Andrew Quilley | Interlex Vocabulary |
| IMB file extension | Perion Network Ltd. | IncredMail Adress Book And Temporary Contacts |
| IMK file extension | Perion Network Ltd. | IncrediMail Licence |
| IML file extension | Sage Software | ACT! Internet Mail Message Format |
| IMN file extension | Perion Network Ltd. | IncrediMail Notify |
| IMOVIELIBRARY file extension | Apple, Inc. | IMovie Event Library |
| IMS file extension | CursorArts Company | IconForge Create Executable Library Data |
| IMV file extension | Yahoo, Inc. | Yahoo! Instant Messenger ImVironment |
| IMX file extension | SAS Institute Inc. | SAS SAS/IML Workshop Matrix |
| IMY file extension | N/A | IMelody Mobile Phone Ring-tone Format |
| IN file extension | N/A | McAfee Antivirus Format |
| IN3 file extension | Harvard Graphics | Harvard Graphics Input Device Driver |
| IN4 file extension | UIC Phoenxsoftware | InfoBlaster IN4 Registry |
| IN7 file extension | Jurgen A Doornik | Ox Data |
| INCA file extension | Adobe Systems | Adobe InDesign Format |
| INDESIGNPLUGIN file extension | Adobe Systems | Adobe InDesign Plugin Format |
| INDEX file extension | The Eclipse Foundation | Eclipse Help Index |
| INDEXARRAYS file extension | Apple, Inc. | Mac OS X Spotlight |
| INDEXCOMPACTDIRECTORY file extension | Apple, Inc. | Mac OS X Spotlight |
| INDEXDIRECTORY file extension | Apple, Inc. | Mac OS X Spotlight |
| INDEXPOSITIONS file extension | Apple, Inc. | Mac OS X Spotlight |
| INDEXPOSITIONTABLE file extension | N/A | Mac OS X Spotlight |
| INDK file extension | Adobe Systems | Adobe InDesign Format |
| INETLOC file extension | N/A | Apple Mac OS X Finder Internet Location Format |
| INFO file extension | N/A | Generic Information Format |
| INFO-1 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-10 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-11 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-12 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-13 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-14 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-15 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-16 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-17 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-18 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-19 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-2 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-20 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-21 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-22 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-23 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-24 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-25 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-26 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-27 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-28 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-29 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-3 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-30 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-4 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-5 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-6 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-7 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-8 file extension | Red Hat, Inc. | Cygwin Info |
| INFO-9 file extension | Red Hat, Inc. | Cygwin Info |
| ING file extension | N/A | MasterCook Ingredients Format |
| INH file extension | Microsoft Corporation | Microsoft Visual Basic Basfwin |
| INIT file extension | WebMoney | WM Keeper CLASSIC Temporary Keys |
| INIX file extension | Adobe Systems Incorporated | Adobe InDesign |
| INJB file extension | Adobe Systems Incorporated | Adobe InDesign |
| INLK file extension | Adobe Systems | Adobe InDesign Lock Format |
| INM file extension | N/A | FaxMaster Document |
| INPUTPLUGIN file extension | Apple, Inc. | Apple Mac OS X PluginIM Input Method |
| INPX file extension | PTV Group | PTV Vissim Network |
| INSP file extension | Microsoft Corporation | Microsoft Visual Studio Inspector |
| INST file extension | N/A | RMCProfile Peak Profile |
| INSTALLHELPER file extension | Apple, Inc. | Apple Mac OS X Install Helper Document |
| INSTALLLOG file extension | Microsoft Corporation | Microsoft .NET Installation Log |
| INT? file extension | Intuit Inc. | Quicken For Mac |
| INTU file extension | Intuit Inc. | Quicken For Mac |
| INVENTOR file extension | SGI | SGI Open Inventor |
| INX file extension | The Inkscape Team | Inkscape Extension Descriptor Format |
| IOBIT file extension | IObit | Advanced SystemCare PRO Backup Format |
| IOC file extension | Nullsoft, Inc. | Winamp Io Extension |
| IOR file extension | Next Limit Technologies | Maxwell Render Index Of Refraction |
| IP3 file extension | wondertouch, LLC | ParticleIllusion Project |
| IPA file extension | Apple, Inc. | IPhone Application |
| IPI file extension | Microsoft Corporation | Microsoft Windows Installer |
| IPKG file extension | Gehtsoft USA, LLC | Indicore SDK Package |
| IPL22 file extension | PLATO Learning, Inc. | PLATO Learning Network Temporary |
| IPO file extension | Flexera Software, Inc. | InstallShield Object Project |
| IPSW file extension | Apple | IPhone, IPad Or IPod Touch Software Firmware Update Format |
| IPUTILS file extension | The GNOME Project | Gnome Desktop |
| IQC file extension | International TechneGroup Incorporated | CADIQ Comparison Analysis Result |
| IQD file extension | Andrew Sorensen | Impromptu Defintion |
| IQF file extension | IRIS | Integra Query |
| IQP file extension | 20-20 Technologies | 20-20 Office Sales Exported Quote |
| IQR file extension | International TechneGroup Incorporated | Cadiq View Analysis Results Data |
| IQS file extension | International TechneGroup Incorporated | CADIQ Summary Log |
| IQT file extension | N/A | Tektronix |
| IQU file extension | TaxCalcUSA, Inc. | AmeriCalc Update |
| IRD file extension | Microsoft Corporation | Microsoft Money Temporary |
| IRG file extension | N/A | Sofya Database Interclass Relation Graph |
| IRIX64BIT file extension | Silicon Graphics, Inc. | Irix 64 Bit Make |
| IS2 file extension | SmartWare Corporation | SmartWare Input Screen |
| IS3 file extension | SmartWare Corporation | SmartWare Input Screen |
| IS4 file extension | SmartWare Corporation | SmartWare Input Screen |
| ISALLIC file extension | equinux USA, Inc. | ISale License |
| ISCORRUPT file extension | Skype Limited | Skype |
| ISL file extension | Flexera Software, Inc. | InstallShield Temporary Installer |
| ISN file extension | N/A | InstallShield Installer Source Format |
| ISV file extension | Exelis Visual Information Solutions | IDL ITools State |
| ITB file extension | Apple, Inc. | ITunes Library Extras |
| ITC file extension | Apple | ITunes Cover Flow Data Format |
| ITD file extension | SDL Tridion | SDL Trados Translation |
| ITP file extension | ITEM Software, Inc. | ITEM ToolKit Project |
| ITQ file extension | SBC | SAIA S-Web Variable Initialization |
| ITXIB file extension | Apple, Inc. | Apple ITunes Dump |
| IVA file extension | N/A | Dementia.4207 Virus Format |
| IVI file extension | Microsoft Corporation | MSDN InfoViewer Topic |
| IVWR file extension | Synaptris, Inc. | IntelliView Offline Report |
| IVX file extension | Beyond 20/20 Inc. | Beyond 20/20 Microdata Directory |
| IWB file extension | SMART Technologies ULC | Common File Format |
| IWL file extension | Incomedia | WebSite X5 License |
| IWM file extension | Kazuo Nakamura | IWriteMusic |
| IWP file extension | InfnityQS | InfinityQS ESPC |
| IWS file extension | N/A | InstallWatch Scan Format |
| IX3 file extension | XELERATE Software, Inc | Instant.Exe 3.0 Script |
| IXC file extension | Esri | ArcView Geocoding Index For Read-write Coverages |
| IXF file extension | N/A | Integration Exchange Format |
| IXS file extension | Esri | ArcView Geocoding Index For Read-write Shape |
| IZD file extension | United Planet | Intrexx Application Export Format |
| JAD file extension | Sun Microsystems | Java Application Descriptor Format |
| JC file extension | FlashGet | FlashGet Partial Download Format |
| JC! file extension | FlashGet | FlashGet Incomplete Download Format |
| JCC file extension | New Planet Software | Code Crusader Project Data |
| JDW file extension | BlackBerry (Research In Motion Limited) | BlackBerry JDE |
| JDX file extension | Page Scholar Inc. | JSpell Dictionary |
| JFD file extension | Freedom Scientific, Inc. | JAWS Synopsis |
| JFL file extension | Systat Software Inc. | SigmaPlot |
| JFR file extension | Renato Nobili | WJVN Fragment |
| JGD file extension | Corel Corporation | Corel PaintShop Photo Pro Gradients |
| JHM file extension | Oracle Corporation | Java Help Mapping |
| JJ file extension | N/A | JavaCC |
| JJF file extension | Flash Jester | Flash Jester Jugglor |
| JJJS file extension | Apple, Inc. | Claris Organizer Format |
| JLS file extension | Freedom Scientific, Inc. | JAWS |
| JMS file extension | Voxtron N.V. | Voxtron TeleButler Interactive Voice Response Call Flow |
| JMX file extension | Apache Software Foundation | Apache JMeter |
| JNL file extension | Actian Corporation | Ingres Journal |
| JOD file extension | Microsoft Corporation | Microsoft Jet OLEDB.4.0 |
| JOR file extension | Microsoft Corporation | Microsoft SQL Server Journal |
| JOT file extension | King Stairs Software | Jot+ Notes Note Data |
| JP4 file extension | Electric Quilt | Electric Quilt |
| JP5 file extension | Electric Quilt | Electric Quilt |
| JPB file extension | JSoftware | Publish Manager Report |
| JPL file extension | Sonic Foundry, Inc. | Siren Jukebox |
| JPT file extension | Quest Software, Inc. | Jprobe Threadalyzer Memory Snapshot |
| JQX file extension | Microsoft Corporation | Microsoft Windows Help Related |
| JRS file extension | Microsoft | Extensible Storage Engine (ESE) Reserve Transaction Log Format |
| JSK file extension | COWON America, Inc. | JetAudio |
| JSM file extension | Gray Design Associates | Jigsaws Galore Jigsaw |
| JSML file extension | The NSR Physiome Project | JSim Model |
| JSV file extension | Steffen Webe | Java Structure Viewer |
| JSXBIN file extension | Adobe Systems | Binary JavaScript Format |
| JTK file extension | Oracle Corporation | Sun Microsystems Java Toolkit |
| JTL file extension | Apache Software Foundation | JMeter Test Results |
| JW file extension | Orchid Technology K.K. | Jigsaw Terminal |
| JWG file extension | Oracle Corporation | Java |
| JWR file extension | Rocket Software, Inc. | LegaSuite GUI J Walk Runtime |
| K file extension | Schrödinger, LLC | MacroModel Chemical Modeller Output |
| K02 file extension | SoftVelocity | Clarion |
| K03 file extension | SoftVelocity | Clarion DOS Database Key |
| K1 file extension | The Database Managers, Inc. | DataFlex Index |
| K12 file extension | The Database Managers, Inc. | DataFlex Index |
| K2 file extension | The Database Managers, Inc. | DataFlex Index |
| K3 file extension | The Database Managers, Inc. | DataFlex Index |
| K4 file extension | The Database Managers, Inc. | DataFlex Index |
| K5 file extension | The Database Managers, Inc. | DataFlex Index |
| K7 file extension | The Database Managers, Inc. | DataFlex Index |
| KAD file extension | Native Instruments, Inc. | Kore User |
| KAL file extension | Hondata, Inc. | KManager Calibration Data |
| KAN file extension | Vincent Peters | Kwalitan Annotation |
| KAS file extension | N/A | Karaoke |
| KBF file extension | Milenix Software Ltd. | MyInfo Document |
| KBN file extension | TeamSpeak Systems | TeamSpeak Keybinding |
| KBX file extension | Free Software Foundation, Inc. | GNU Privacy Guard Keybox |
| KCT file extension | Tavultesoft | Keyman Developer Customization Source |
| KD3 file extension | Yayoi Co., Ltd. | Yayoi Kaikei Accounting Data |
| KDELNK file extension | KDE e.V | KDE Desktop |
| KDF file extension | Stephen Kay | KARMA MW/Triton Data |
| KDL file extension | Team T10C6 | Kill The Deadline Storage |
| KDT file extension | Laboratory of Reclamation Works & Water Resources Management | Medbasin Evaporation Data |
| KDX file extension | Google Inc. | Google Earth Import Definition |
| KER file extension | Exelis Visual Information Solutions | ENVI Filter Kernels |
| KEV file extension | Freedom Scientific, Inc. | JAWS Preload |
| KEYTAB file extension | Apple, Inc. | Unix Kerberos Encrypted Key |
| KFG file extension | Adobe Systems Incorporated | Adobe Acrobat Rule |
| KFL file extension | KFLog Team | KFLog Airfield |
| KFS file extension | David Harris | Pegasus Mail Static Kill |
| KHD file extension | Microsoft | Microsoft Dynamics AX Kernel Help Data Format |
| KHI file extension | Microsoft | Microsoft Dynamics AX Kernel Help Index Format |
| KID2 file extension | The Software MacKiev Company | Kid Pix |
| KIDS file extension | The Software MacKiev Company | Kid Pix |
| KIF file extension | Autodesk, Inc. | AutoCAD Key Index |
| KKW file extension | Adobe Systems Incorporated | Adobe RoboHelp Keyword Help Project Index |
| KLF file extension | Frank Böpple | KaloMa |
| KLK file extension | Orgadata AG | Orgadata LogiKal |
| KLP file extension | PHOENIX CONTACT | CLIP PROJECT Terminal-strip Project |
| KM file extension | BMC Software, Inc. | BMC Patrol |
| KMA file extension | Correlate | Correlate Archive Knowledge Map |
| KMD file extension | Sharman Networks Ltd. | KaZaa Media Desktop |
| KMDR file extension | N/A | Kommander |
| KMF file extension | Vincent Peters | Kwalitan Memo |
| KMM file extension | K-Meleon | K-Meleon Macro Module Format |
| KMN file extension | Tavultesoft | Keyman Developer Source |
| KMR file extension | KnowledgeMill | KnowledgeMill Link Format |
| KMS file extension | Correlate | Correlate Solution Topic |
| KMX file extension | Tavultesoft | Keyman Desktop Compiled Keyboard |
| KNF file extension | Orchida Soft | Orchida Knitting System |
| KNNK file extension | Nuance Communications, Inc. | OmniPage |
| KOE file extension | Aquest | AquesTone Vocal Synthesizer Syllable |
| KPE file extension | Native Instruments, Inc. | KORE Performance |
| KPJ file extension | N/A | Keyman Developer Project |
| KPS file extension | Tavultesoft | Keyman Developer Packaged Source |
| KRG file extension | Sybase Inc. | Sybase Adaptive Server Information |
| KS-IA1 file extension | Kuta Software LCC | Infinite Algebra |
| KSD file extension | Native Instruments, Inc. | Absynth Kore Patch Format |
| KSDS file extension | Native Instruments, Inc. | Absynth Kore Patch Format |
| KSI file extension | Tube City IMS, LLC. | Alloy Blending System ASCII Data |
| KSL file extension | Airwer Ltd | Karaoke Song List Creator Song List |
| KSS file extension | Rakonza.com | K-ForCE Score Sheet |
| KTH file extension | N/A | Apple IWork Keynote Theme Format |
| KTX file extension | Vincent Peters | Kwaitan |
| KVK file extension | Tavultesoft | Keyman Desktop On Screen Keyboard |
| KWB file extension | Vincent Peters | Kwalitan Work |
| KWF file extension | Embarcadero Technologies, Inc. | Delphi Pascal Chart |
| KWL file extension | N/A | KWalletManager |
| KWM file extension | WebMoney | WebMoney Key Format |
| KXX file extension | Tavultesoft | Custom Keyman Engine Product |
| KYN file extension | ESTsoft Corp. | ALSee Thumbnail Cache |
| KYR file extension | IBM | Lotus Domino Key Ring Format |
| L2L file extension | IBM | IBM Voice Type Languages Addword |
| L2P file extension | IBM | BM Voice Type Languages Addword |
| L5K file extension | Rockwell Automation, Inc. | RSLogix 5000 |
| LABX file extension | LEYBOLD | CASSY Lab |
| LAE file extension | IBM | Local Authentication Export |
| LAF file extension | Lingoes Project | Lingoes Appendix |
| LAI file extension | GNU Project | GNU Libtool Temporary |
| LANALYSER file extension | Novell, Inc. | Novell Netware LANalyzer Trace |
| LAND file extension | UserLand Software, Inc. | Userland Frontier |
| LAO file extension | Seiko Epson Corporation | EPSON SMART PANEL |
| LAR file extension | Geneva Media, LLC | Liquid Audio Player Registration |
| LASTBUILDSTATE file extension | Microsoft Corporation | MSBuild Exported Build |
| LAT file extension | LaTeX Project Development Team | LaTeX |
| LAUNCHEREX_SOURCERECORD file extension | Google Inc. | Foston Google Android |
| LAV file extension | Geneva Media, LLC | Liquid Audio Player Voucher |
| LAY file extension | Apple | Apple DVD Studio Pro Layout Format |
| LAYERDIAGRAM file extension | Microsoft Corporation | Microsoft Visual Studio Layer Diagram |
| LBA file extension | Shoptalk Systems | Liberty BASIC |
| LBD file extension | Llamagraphics | Life Balance User Data |
| LBE file extension | Llamagraphics | Life Balance Xml-based Data Exchange |
| LBG file extension | dataBased Intelligence, Inc. | DBASE IV Label Generator Data |
| LBO file extension | dataBased Intelligence, Inc. | DBASE IV Compiled Label |
| LBP file extension | Schneider Electric S.A. | ProWORX Nxt Logic Pointer |
| LBXDTP file extension | Libronix Corporation | Libronix DLS Data Type |
| LBXLLS file extension | Logos Research Systems, Inc. | Logos Libronix 3.0 |
| LCI file extension | IBM | IBM Voice Type Languages Newuser |
| LCK file extension | N/A | Lock Format |
| LCL file extension | N/A | Localization |
| LCLW file extension | Apple, Inc. | ClarisWorks Art Library |
| LCP file extension | FireModels.org | FARSITE Landscape Data |
| LCS file extension | The Sage Group plc | ACT! History |
| LCT file extension | James L. Tonne | Electrical Filter Design |
| LCX file extension | Cray Inc. | LC Model |
| LD file extension | Corel Corporation | Corel Paradox Language Driver |
| LD1 file extension | dataBased Intelligence, Inc. | DBASE Overlay |
| LDB file extension | Microsoft | Microsoft Access Record-Locking Information Format |
| LDD file extension | LEGO Group | LEGO Digital Designer |
| LDL file extension | Corel Corporation | Corel Paradox Delivered Library |
| LDP file extension | CAM Development | Label Designer Plus DELUXE Data |
| LDX file extension | global heavy industries | Liquid Studio Liquid Executable Bytecode |
| LEGAL file extension | DaveTech | DaveTech Legal Document |
| LEP file extension | CAM Development | Label And Envelope Designer Plus 2000 |
| LET file extension | Genesis 2000, Inc. | Genesis 2000 |
| LETTER file extension | N/A | Undeliverable Mail Format |
| LEV file extension | SINTEF | CARE-S InfoWorks Level |
| LFA file extension | Credo Interactive Inc. | Life Forms |
| LFM file extension | Credo Interactive Inc. | LifeForm Format |
| LG0 file extension | IBM | IBM Tivoli Monitoring Log |
| LG1 file extension | IBM | IBM Tivoli Monitoring Log Backup |
| LG2 file extension | DCC Corporation | HotMux Thermocouple Data Log |
| LGA file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGD file extension | Microsoft Corporation | Windows Application Log |
| LGG file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGJ file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGK file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGM file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGN file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGQ file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGR file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGV file extension | Microsoft Corporation | Debugging Tools For Windows Logger Log |
| LGW file extension | ANSYS Inc. | Ansys |
| LGZ file extension | Microsoft Corporation | Windows Application Log |
| LHX file extension | GridSense | LineTracker Firmware Upgrade |
| LIA file extension | Altium Limited. | P-CAD Schematics Library |
| LIB4D file extension | MAXON Computer GmbH | Cinema 4D Library |
| LICENSEKEY file extension | Coriolis Systems | Coriolis IPartition License Information Format |
| LICKEY file extension | Online Media Technologies Ltd. | AVS4YOU License Key |
| LICRYPT file extension | N/A | Encrypted |
| LID file extension | Kodak | Kodak EasyShare Album Format |
| LIG file extension | Teldas GmbH | INet-Server |
| LIK file extension | N/A | Trojan.Win32.Agent.lik |
| LINK file extension | N/A | Apple IPod Link Format |
| LINX file extension | N/A | Apple IPod Links Folder Format |
| LITEMOD file extension | Mumfrey | Minecraft Mod |
| LITTLE file extension | Mozilla Corporation | Mozilla Firefox Start-up Cache |
| LIV file extension | Cantoche | Living Actor Actor |
| LIVESUBSCRIBE file extension | N/A | Symantec Antivirus Update Catalog |
| LKH file extension | N/A | Worm.Generic.LKH Virus |
| LKO file extension | Microsoft Corporation | Microsoft Outlook Express |
| LKR file extension | Microchip Technology Inc. | MPLAB Linker |
| LLP file extension | General Electric Company | VersaPro Local Logic Block |
| LLT file extension | Liquidity Lighthouse | Liquidity Lighthouse Transaction Format |
| LLV file extension | LockLizard Limited | Lizard Safeguard License |
| LMBS file extension | Adobe Systems Incorporated | Adobe Photoshop For Mac Filter |
| LMD file extension | ABBYY | Abbyy Finereader Sprint |
| LMF file extension | Cadence Design Systems, Inc. | Library Mapping And Altera Data Interchange |
| LMH file extension | L.Spiro | Memory Hacking Software Memory |
| LMLPACK file extension | SUGIMOTO Tomohiko | Kashmir 3D Link |
| LMR file extension | Intuit Inc. | QuickBooks Loan Manager Data |
| LMT file extension | Enterbrain, Inc. | RPG Maker 2000/2003 Map Tree |
| LNA file extension | Xilinx, Inc. | Xilinx ISE |
| LNF file extension | Philippe Blanc | Oyoaha Lookandfeel Interface Elements |
| LNG file extension | N/A | Language Definition Format |
| LNGX file extension | Dominik Reichl | KeePaas Language |
| LNM file extension | Corel Corporation | Corel WordPerfect SGML Alias |
| LOADTEST file extension | Microsoft Corporation | Microsoft Visual Studio Load Test |
| LOCAL file extension | Embarcadero Technologies, Inc. | Delphi User-specific Project Options |
| LOCALSTORAGE-JOURNAL file extension | Google Inc. | Google Chrome Rollback Journal |
| LOCK file extension | N/A | Lock Format |
| LOCK_SYNC file extension | Apple, Inc. | Synchronization Lock |
| LOGONVISTA file extension | Stardock | Stardock LogonStudio Windows Vista Logon Screen Format |
| LOGONXP file extension | Stardock | LogonStudio Document Format |
| LOK file extension | Nuance Communications, Inc. | OmniPage 9 |
| LON file extension | CGS plus | Aquaterra Profile Data |
| LOOV file extension | Smadsoft | Smadav Virus Definitions Format |
| LOT file extension | LaTeX Project Development Team | LaTex Auxiliary File For List Of Tables |
| LOV file extension | SAP AG | SAP Business Objects |
| LPA file extension | MP Filtri UK Ltd | LPA View Laser Particle Analyser |
| LPF file extension | Orgadata AG | Orgadata LogiKal |
| LPI file extension | http://www.lazarus.freepascal.org/ | Free Pascal Lazarus Project Information |
| LPN file extension | SYSTEMS EUROPE sa/nv | LVPLAN |
| LPT file extension | N/A | LogPlot Compiled Boring Log |
| LPU file extension | SDL | Passolo Localization Project |
| LPW file extension | IRIS | IRIS Laserform Lforms |
| LQF file extension | Jan Debis | LeechFTP Save Queue |
| LR file extension | Adtollo | Chaos Desktop Layer List |
| LRC file extension | N/A | Lyric Format |
| LRCAT-JOURNAL file extension | Adobe Systems Incorporated | Adobe Photoshop Lightroom |
| LRD file extension | Microsoft Corporation | Microsoft Money Lock |
| LRL file extension | SmartWare Corporation | SmartWare Local Resource Library |
| LRM file extension | Microsoft Corporation | Microsoft Encarta Class Server Learning Resource |
| LRPLUGIN file extension | Adobe Systems | Adobe Photoshop Lightroom Plug-in Format |
| LRTOOLKIT file extension | Adobe Systems Incorporated | Adobe Photoshop Lightroom |
| LRWEBENGINE file extension | Adobe Systems | Lightroom Folder |
| LRY file extension | Konica Minolta Holdings, Inc. | Konica Minolta Data Management Software Reference Data |
| LSA file extension | N/A | Lotus Designer Agent |
| LSAPROTOTYPE file extension | Microsoft Corporation | Microsoft Visual Studio Logical Datacenter Diagram Toolbox Prototype |
| LSC file extension | Siemens AG | LOGO! Soft Comfort |
| LSLIBRARY file extension | Realmac Software Limited | Littlesnapper User Library Package |
| LSN file extension | MakeMusic | Finale Lesson Format |
| LSQ file extension | IBM | IBM Voice Type Languages Addword |
| LSTX file extension | Rick Meyers | E-Sword Verse List |
| LSZ file extension | Tribal | Learning Score Zip |
| LTB file extension | Amma Software | Amma Little Setup Builder |
| LTC file extension | Ulrik Sandborg-Petersen | LTC Syntactically Analyzed Text |
| LTCX file extension | Ulrik Sandborg-Petersen | LTC Syntactically Analyzed Text XML |
| LTD file extension | Lifescope, Inc. | LivingTime Data |
| LTF file extension | STG Interactive | Frogans Short-cut Format |
| LTH file extension | Roxio | Roxio Label Creator Style |
| LTKEY file extension | Almeza Company | LeaderTask Key |
| LTL file extension | DIAL GMBH | DIALux Luminaire Data |
| LUAR file extension | UltraDefrag Development Team | UltraDefrag Lua Report |
| LUCS file extension | W3C | Amaya Tools |
| LUD file extension | SINTEF | CARE-S InfoWorks Land Use |
| LUM file extension | Kevin Chong | Luminous Song List |
| LUZ file extension | Coloritto BV | Spectramap |
| LVCLASS file extension | National Instruments Corporation | LabVIEW Class Library |
| LVIX file extension | EditShare | Lightworks Video Index |
| LVLIB file extension | National Instruments Corporation | LabVIEW Project Library |
| LVLIBP file extension | National Instruments Corporation | LabVIEW Packed Project Library |
| LVR file extension | Microsoft Corporation | Microsoft Visual Studio Environment Snapshot |
| LW2 file extension | John McKernon Software | Lightwright Show Data |
| LW3 file extension | John McKernon Software | Lightwright Data |
| LW5 file extension | John McKernon Software | Lightwright Show Data |
| LWL file extension | John McKernon Software | Lightwright Printed Paperwork Formatting Instructions |
| LWM file extension | Harald-René Flasch | LittleWays Map |
| LWQ file extension | Grassland, Soil & Water Research Laboratory | SWAT Lake Water Quality Input |
| LWT file extension | John McKernon Software | Lightwright Attribute List |
| LWTB file extension | Likno Software Inc. | Likno Web Tabs Builder |
| LWTP file extension | LimeWire | LimeWire Theme Format |
| LWZ file extension | NewTek, Inc. | LightWave 3D Plugin |
| LXA file extension | Microsoft | Microsoft Speech Engines Lexicon Format |
| LXD file extension | PPCLINK Mobile Software | EDictionary Reader Dictionary Data |
| LYR file extension | ESRI | ArcView Layer Format |
| M!95 file extension | Adobe Systems Incorporated | Adobe Director For Mac |
| M10 file extension | Microsoft Corporation | Microsoft Money 2002 Data |
| M11 file extension | Microsoft Corporation | Microsoft Money 2003 Data |
| M14 file extension | Microsoft Corporation | Microsoft Money 2005 Backup Data |
| M16 file extension | Microsoft Corporation | Microsoft Money 2007 Data |
| M1C file extension | IBM | IBM Voice Type Languages Newuser |
| M1I file extension | N/A | IBM Voice Type Languages Newuser |
| M25 file extension | N/A | Symantec Endpoint Protection Manager |
| M2C file extension | IBM | IBM Voice Type Languages Newuser |
| M2I file extension | IBM | IBM Voice Type Languages Newuser |
| M2L file extension | Maxthon International Limited | Maxthon Language Package |
| M2P file extension | Maxthon | Maxthon Plugin Installation Package Format |
| M3C file extension | IBM | IBM Voice Type Languages Newuser |
| M3I file extension | IBM | IBM Voice Type Languages Newuser |
| M3X file extension | MAGIX AG | MAGIX Digital Photo Maker PhotoCD Playlist |
| M4C file extension | IBM | IBM Voice Type Language Newuser |
| M4D file extension | The Sage Group plc | Sage MAS 90 Data |
| M4I file extension | IBM | IBM Voice Type Languages Newuser |
| M4L file extension | The Sage Group plc | Sage MAS 90 Data |
| M68 file extension | Embarcadero Technologies, Inc. | Turbo Pascal DOS |
| M7P file extension | N/A | Multilizer PDF Translator Project |
| M?? file extension | Actian Corporation | Ingres Modify Table/Index |
| MA2 file extension | Olle Persson | Bibexcel |
| MAB file extension | Mozilla | Mozilla Address Book Format |
| MAD file extension | N/A | Microsoft Access Module Shortcut Format |
| MAG file extension | Microsoft | Microsoft Access Diagram Shortcut Format |
| MAILLOC file extension | Apple, Inc. | Apple Mac OS X Finder Mail Internet Location |
| MAILPLANELICENSE file extension | uncomplex | Mailplane License Format |
| MAILTOLOC file extension | Apple | Apple Mail Mail Address Format |
| MAIN file extension | FileMaker, Inc. | FileMaker Dictionary |
| MAJ file extension | Autodesk, Inc. | Camduct Job |
| MAKER file extension | Adobe Systems Incorporated | Adobe Framemaker |
| MANAGED_MANIFEST file extension | Microsoft Corporation | Silverlight Manifest |
| MAR file extension | Microsoft | Microsoft Access Report Shortcut Format |
| MAT file extension | Microsoft | Microsoft Access Table Shortcut Format |
| MATCH-RDB file extension | Richard Hughey - Kevin Karplus - Anders Krogh | RDB |
| MATH file extension | Paul Hunter | AnalyticMath |
| MAU file extension | N/A | Media Attachment Unit Format |
| MAW file extension | N/A | Microsoft Access Data Access Page Format |
| MAXD file extension | N/A | PaperPort Annotation |
| MAXM file extension | N/A | Paperport |
| MB3 file extension | SUIGYODO ONLINE | Minimal Board Editor (MBE) |
| MBA file extension | Beneficent Technology, Inc. | Martus Human Rights Bulletin System |
| MBB file extension | Kodak | Kodak EasyShare Data Format |
| MBC file extension | Cyrus Daboo | Mulberry E-mail Client Cache |
| MBS file extension | Opera Software | Opera Mailbox Format |
| MC2 file extension | ValuSoft | MasterCook Cookbook Recipe Text Data Format |
| MCACC file extension | Pioneer Europe NV | MCACC Measurement Data |
| MCB file extension | N/A | NEPLAN Project |
| MCF file extension | ValuSoft | MasterCook Cookbook Format |
| MCFI file extension | Autodesk | Autodesk Maya Initial Fluid Cache Format |
| MCFP file extension | Autodesk | Autodesk Maya Fluid Cache Playback Format |
| MCI file extension | N/A | Media Control Interface Command Script Format |
| MCO file extension | Microsoft | MSN Messenger Wink Format |
| MCT file extension | Microsoft Corporation | MapChart Genetic Map Data |
| MCUSW file extension | Nokia Corporation | Nokia Mobile Phones With Symbian Firmware |
| MD0 file extension | Adobe Systems | Adobe Photoshop Format Browser Metadata Cache Format |
| MD03 file extension | Adobe Systems Incorporated | Adobe Director |
| MD2P file extension | Matt Holwood | MessengerDiscovery |
| MD2S file extension | Matt Holwood | MessengerDiscovery |
| MD5 file extension | N/A | Checksum Format |
| MDA file extension | N/A | Microsoft Access Add-in Format |
| MDAT file extension | John Mulcahy | REW Measurement |
| MDE file extension | N/A | Microsoft Access Compiled Database (application) Format |
| MDES file extension | Trimaran Team | Trimaran Machine Description |
| MDF file extension | SDL | Translation Memory Data Find Format |
| MDG file extension | Sparx Systems Pty Ltd. | Enterprise Architect |
| MDL file extension | N/A | Flight Simulator 95/98 3D Model Format |
| MDPL file extension | Apple, Inc. | MacDraw II |
| MDRW file extension | Apple, Inc. | MacDraw |
| MDUS file extension | Matt Holwood | MessengerDiscovery |
| MDW file extension | N/A | Microsoft Access Workgroup Information Format |
| MEA file extension | Malvern Instruments Ltd. | Mastersizer 2000 Sample Analysis |
| MECONTACT file extension | Microsoft Corporation | Microsoft Live Messenger |
| MEMB file extension | Parametric Technology Corporation | Pro/ENGINEER Temporary |
| MEN file extension | SoftCafe | MenuPro Restaurant Menu Design |
| MENUDATA file extension | VMware, Inc. | VMWare Cache |
| MEQ file extension | Corel Corporation | Corel WordPerfect Macro Editor Print Queue |
| MERLINLICENSE file extension | ProjectWizards | Merlin License Format |
| MES file extension | Corel Corporation | Corel WordPerfect Macro Editor Work Space |
| MESA file extension | SGI | OpenGL GLUT |
| METASTOCK file extension | Thomson Reuters | Metastock Data |
| METRICLOG file extension | Apple, Inc. | Apple IOS Diagnostic |
| MEU file extension | Microsoft Corporation | DOS Shell Menu Group |
| MEX4 file extension | MathWorks, Inc. | Sun-4/SPARC Dynamically Linked Subroutines |
| MEXDS file extension | MathWorks, Inc. | MATlab Dynamically Linked Subroutines |
| MEXHP3 file extension | MathWorks, Inc. | Matlab HP9000/series 300 Dynamically Linked Subroutines |
| MEXHP7 file extension | MathWorks, Inc. | Matlab HP9000/series 700 Dynamically Linked Subroutines |
| MEXN file extension | MathWorks, Inc. | Matlab NeXT Dynamically Linked Subroutines |
| MEXRS6 file extension | MathWorks, Inc. | Matlab IBM RS/6000 Dynamically Linked Subroutines |
| MEXSG file extension | MathWorks, Inc. | Matlab Dynamically Linked Subroutine |
| MF2 file extension | Adobe Systems Incorporated | Authorware Mediator5 Multimedia |
| MFASL file extension | AOL Inc. | Netscape XUL Fastload Format |
| MFG file extension | Parametric Technology Corporation | ProEngineer Manufacturing |
| MFI file extension | Microsoft Corporation | Windows 98 Resource Kit |
| MFIL file extension | Blizzard Entertainment | Blizzard Software Update Format |
| MFJ file extension | Jarrold Group - Physical and Analytical Chemistry | MOBCAL Data |
| MFR file extension | Autodesk, Inc. | Autodesk Moldflow Result |
| MFW file extension | MobileFrame | Motorola MSS Box Firmware Format |
| MFX file extension | Clickteam | Multimedia Fusion Extension Format |
| MGD file extension | Maxium Developments | Master Grade Gradebook |
| MGDATABASE file extension | Mariner Software | MacGourmet Deluxe Database Format |
| MGE file extension | N/A | MGE Data Server Project |
| MGO file extension | Mariner Software | MacGourmet Recipe Format |
| MGSPOT file extension | Mariner Software, Inc. | MacGourmet Metadata |
| MGT file extension | Musicnotes | Guitar Guru Song Format |
| MHS file extension | N/A | Xilinx Platform Studio Hardware Specification Format |
| MHV file extension | Husqvarna Viking | Husqvarna Viking Data |
| MI file extension | Oracle Corporation | AutoVue Graphic Plugin |
| MIF file extension | N/A | Management Information Format |
| MIH file extension | Brain Research Institute | MRtrix Image Header |
| MILK file extension | Nullsoft | Winamp MilkDrop Plugin Configuration Format |
| MIV file extension | MapImagery Pty Ltd. | MapImagery Vendor Profile |
| MJ3 file extension | id Software LLC | Id Software Online Sale |
| MJDOC file extension | Mariner Software | MacJournal Document Format |
| MJG file extension | N/A | Trojan |
| MJR file extension | J. River, Inc. | Media Jukebox Registration |
| MJZ file extension | N/A | Trojan.Win32.Agent.mjz |
| MKC file extension | Advanced Computer Innovations, Inc. | MagicKey Currency Exchange Rate |
| MKH file extension | N/A | WinMark Pro Mark |
| MKS file extension | ValuSoft | MasterCook Cookbook |
| ML2 file extension | Hypercube, Inc. | Tripos MOL2 Molecule |
| ML3 file extension | CheckMark Software Inc. | MultiLedger Chart Of Accounts |
| ML4 file extension | KIDASA Software, Inc. | Milestones 4 Schedule |
| ML5 file extension | CheckMark Software Inc. | MultiLedger Vendor |
| ML9 file extension | N/A | Milestones Professional 2004U Schedule |
| MLA file extension | KIDASA Software, Inc. | Professional 2006 Schedule |
| MLD file extension | Dr. Torben Weibert | MAirList Desktop |
| MLE file extension | Dr. Torben Weibert | MAirList Event List |
| MLG file extension | IBM | IBM Communications Server Message |
| MLIB file extension | Richard Hughey - Kevin Karplus - Anders Krogh | Model Library |
| MLL file extension | Autodesk, Inc. | AutoDesk Maya Plug-in Format |
| MLOCATE file extension | The GNOME Project | Gnome Desktop |
| MLR file extension | IV Produkt AB | Mollier Sketcher |
| MLS file extension | Crystal Reality | CrystalPlayer Playlist Format |
| MLT file extension | Business Forecast Systems, Inc. | Forecast Pro Multivariate Forecast |
| MLV file extension | National Instruments Corporation | LabVIEW Mathscript |
| MLW file extension | N/A | MainLog Data |
| MM4 file extension | Microsoft Corporation | Microsoft Windows Word Processing Format |
| MMB file extension | www.MediaChance.com | MultiMedia Builder |
| MMD file extension | Dr. Torben Weibert | MAirList Metadata |
| MMDR file extension | Adobe Systems Incorporated | Adobe Director |
| MMIP file extension | Ventis Media | MediaMonkey Installation Format |
| MMO file extension | Memory-Map | Memory-Map Navigator Overlay Format |
| MMPA file extension | MOR YAZILIM | MoreMotion Application Studio Page |
| MMS file extension | N/A | Multimedia Messaging Service Message |
| MMT file extension | CoCo Systems Ltd. | CoCo Systems VisiMap |
| MN1 file extension | Microsoft Corporation | Microsoft Money Version 1 Data |
| MN2 file extension | Microsoft Corporation | Microsoft Money Version 2 Data |
| MN3 file extension | Microsoft Corporation | Microsoft Money Version 3 Data |
| MN4 file extension | Microsoft Corporation | Microsoft Money 95 Data |
| MN5 file extension | Microsoft Corporation | Microsoft Money 97 Data |
| MN6 file extension | Microsoft Corporation | Microsoft Money 98 Data |
| MN7 file extension | Microsoft Corporation | Microsoft Money 99 Data |
| MN8 file extension | Microsoft Corporation | Microsoft Money 2000 Data |
| MN9 file extension | Microsoft Corporation | Microsoft Money 2001 Data |
| MNB file extension | SciFace Software GmbH & Co. | MuPAD |
| MNE file extension | Microsoft Corporation | Microsoft Money |
| MNF file extension | MSC Software Corporation | ADAMS/Flex |
| MNIT file extension | FlashPeak Inc. | FlashPeak SlimBrowser |
| MNL file extension | Autodesk | Autodesk AutoCAD Menu LISP Format |
| MNP file extension | Ultrasoft Digital Media | Ultrasoft Money |
| MNX file extension | N/A | Visual FoxPro Main (DBF) Menu Description Format |
| MOBILEPROVISION file extension | Apple | Xcode Mobile Provisioning Profile |
| MOD file extension | Graphisoft | ArchiCAD Module |
| MODE file extension | Panic | Coda For Mac Plugin Format |
| MODE2V3 file extension | Apple, Inc. | Xcode Project Related |
| MODELPROJ file extension | Microsoft Corporation | Microsoft Visual Studio Modelling Project |
| MODULE file extension | Drupal | Drupal Module Format |
| MOL2 file extension | Tripos, L.P. | Portable Representation Of A SYBYL Molecule |
| MOLOGIQ file extension | N/A | HTC EVO 3D |
| MONTAGE file extension | Mariner Software | Montage Screenplay Format |
| MONTE file extension | School of Aquatic & Fishery Sciences, University of Washington | CRiSP Harvest |
| MOOD file extension | N/A | Amarok Moodbar Data |
| MOP file extension | N/A | MOPAC Input Format |
| MOPINT file extension | N/A | Mopac Internal Chemical Modeller Input |
| MOPOUT file extension | N/A | MOPAC Chemical Output |
| MOR file extension | Corel Corporation | Corel Shared Writing Tools |
| MORG file extension | umonkey-tools | Morg |
| MOTN file extension | Apple, Inc. | Apple Motion Motion |
| MOZ-DELETE file extension | Mozilla Corporation | Mozilla Firefox Update |
| MOZ-UPGRADE file extension | Mozilla Corporation | Mozilla Firefox Upgrade |
| MP5 file extension | Waterloo Maple Inc. | Maple Windows DOS |
| MP8 file extension | National Instruments Corporation | NI Multisim V8 Project |
| MPCPL file extension | Media Player Classic | Media Player Classics Playlist Format |
| MPH file extension | COMSOL | COMSOL Multiphysic Files |
| MPLF file extension | Freescale Semiconductor, Inc. | CodeWarrior Library |
| MPRJ file extension | Native Instruments, Inc. | Maschine Project |
| MPSY file extension | Freescale Semiconductor, Inc. | CodeWarrior Debug Symb |
| MQH file extension | MetaQuotes Software Corp. | MetaTrader Trading Terminal |
| MQL file extension | MetaQuotes Software Corp. | MetaTrader Indicator |
| MREC file extension | inoage GmbH | MADRIX Record |
| MRF file extension | J. Klein Productions Inc. | Grade Busters Teacher Tools |
| MRK file extension | N/A | DPOF Digital Print Order Format Auto Print Order Format |
| MRO file extension | Graham Jones | SharpEye Music Reader |
| MRP file extension | MathRevolt | Infinity Solution Plot |
| MRV file extension | ChemAxon Ltd. | MarvinSketch |
| MS-TNEF file extension | N/A | Microsoft Transport Neutral Encapsulation Format |
| MS2 file extension | N/A | SEQUEST Ms2 |
| MSCG file extension | N/A | Microsoft Clip Art Gallery For Mac |
| MSE-INSTALLER file extension | SourceForge.net | Magic Set Editor Installer |
| MSF file extension | N/A | Mozilla Thunderbird Mail Summary Format |
| MSGR file extension | N/A | Microsoft Graph 5 |
| MSHXML file extension | Microsoft Corporation | Microsoft XML Typedata |
| MSI file extension | Microsoft | Microsoft Windows Installer Installation Package |
| MSJ file extension | MicroSurvey Software Inc. | MicroSurvey CAD Temporary |
| MSO file extension | Microsoft | Inline E-mail Attachment |
| MSOF file extension | Microsoft Corporation | Microsoft Office For Mac |
| MSRCINCIDENT file extension | Microsoft | Microsoft Windows Remote Assistance Request Format |
| MSTAT file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Domain Output |
| MSTT file extension | Insoft Oy. | Prosa Minispecification |
| MSU file extension | Microsoft | Microsoft Update Standalone Package Format |
| MSWK file extension | N/A | Microsoft Works For Mac |
| MTA file extension | Samsung | Samsung AllShare Metadata Format |
| MTB file extension | Minitab Inc. | Minitab |
| MTC file extension | Rainer Goebel | BrainVoyager QX Functional Data |
| MTD file extension | Musicnotes | Musicnotes Digital Music Sheet Format |
| MTDD file extension | N/A | MEDITECH Document Definition |
| MTF file extension | N/A | MasterCook Tip Format |
| MTG file extension | Jay Klein Productions | Making The Grade |
| MTHD file extension | MOPEKS Organisation | MOPEKS Method |
| MTKEY file extension | proDAD Inc. | ProDAD Heroglyph License |
| MTO file extension | FastCAM Inc. | FastCAM MTO Data |
| MTX file extension | N/A | MadTracker Extension Format |
| MULIB file extension | Adobe Systems Incorporated | Adobe Muse Exported Library |
| MULT file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Alignment Output |
| MUSX file extension | Moretti & Murphy Reporting | Min‐U‐Script Xpress Transcript Data |
| MUT file extension | Broad Institute | Integrative Genomics Viewer Mutations List |
| MVF file extension | Autodesk, Inc. | AutoFlix Stop Frame |
| MVI file extension | Autodesk | Autodesk AutoCAD Movie Command Format |
| MVS file extension | N/A | Xilinx Project Language And Simulation Format |
| MW2 file extension | Logo Computer Systems Inc. | MicroWorlds Logo Activity |
| MW2D file extension | Apple, Inc. | Apple MacWrite |
| MW2S file extension | Apple, Inc. | MacWrite II Model |
| MWC file extension | Object Computing, Inc | Make Project Creator Input |
| MWDP file extension | Freescale Semiconductor, Inc. | CodeWarrior Debugger |
| MWF file extension | SDL | Memory Word Find Format |
| MWI file extension | Medlin Accounting | Medlin Payroll Software Invoice Layout Information |
| MWLIC file extension | No Thirst Software | MoneyWell License Information Format |
| MXADDON file extension | Maxthon International | Maxthon Addon Format |
| MXC file extension | Esri | ArcView Geocoding Index For Read-write Coverages |
| MXC3 file extension | MAGIX AG | Magix Photo Manager Thumbnail Cache |
| MXFD file extension | ABBYY | ABBYY Form |
| MXIT file extension | N/A | MXit Data |
| MXN file extension | Mobiiko | Miinoto Exchangeable Note Format |
| MXP file extension | Adobe Systems | Adobe (Macromedia) Extension Package Format |
| MXPRJ file extension | Native Instruments, Inc. | Maschine 2.0 Project |
| MXSD file extension | IBM | IBM WebSphere Message Definition |
| MXZ file extension | Maximizer Software Inc. | Maximizer Data |
| MYB file extension | MYOB Limited | MYOB Data |
| MYE file extension | MYOB Limited | MYOB |
| MYOB file extension | MYOB Limited | MYOB Data |
| MYOX file extension | MYOB Limited | MYOB Data |
| MZ2 file extension | N/A | Maze-solver MZ2 |
| MZB file extension | N/A | MegaZeux Board |
| MZE file extension | Gregory Peatfield | Maze Creator |
| MZT file extension | David Webber | MOZART Template |
| MZV file extension | Enliven Marketing Technologies Corporation | Viewpoint Media Player ZoomView Titles |
| MZZ file extension | Microsoft | Microsoft .NET Framework Installation Package Format |
| M_P file extension | Parametric Technology Corporation | Pro/ENGINEER Temporary |
| N88 file extension | Apple, Inc. | Apple IOS Kernel Cache |
| N92 file extension | Apple, Inc. | Apple IOS Firmware |
| NA2 file extension | Mozilla | Seamonkey Address Book Format |
| NAB file extension | AOL Inc. | Netscape Communicator Addressbook |
| NACL file extension | Sig Software | NameCleaner |
| NAF file extension | Native Instruments, Inc. | TRAKTOR Service |
| NAL file extension | Microsoft Corporation | System Management Server Network Abstraction Layer |
| NAV file extension | Microsoft | MSN Application Extension Format |
| NAV2 file extension | ZJMedia | WinAVI Temporary Navigation Format |
| NB2 file extension | DJI Interprises, LLC | Newsbin Unfinished Download |
| NBM file extension | Oracle | NetBeans Module Format |
| NBP file extension | NeoSoft | NeoBook Plugin Format |
| NBR file extension | Novawave, inc | Saved Benchmark Result |
| NC2 file extension | newsleecher.com | NewsLeecher Cache |
| NC? file extension | Trend Media Corporation Limited | FlashGet Download Manager Incomplete Download |
| NCC file extension | N/A | CNC (Computer Numeric Control) Control File (CamView 3D) |
| NCH file extension | Microsoft | Microsoft Outlook Express Email Tree |
| NCOMP file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Dirichlet Mixture Prior Library |
| NCS file extension | AOL Inc. | Netscape Conference Call |
| NCSS file extension | NCSS | NCSS Data |
| NCW file extension | Nero | Nero CoverDesigner Picture Template Format |
| NCX file extension | IDPF | Navigation Control File For XML |
| ND5 file extension | N/A | Nintendo DS Game ROM Format |
| NDL file extension | IBM | Lotus Notes Data Format |
| NDOTS file extension | M.Carson | Ribbons Ndots |
| NDR file extension | Nikon Corporation | Nikon Capture Image Dust Off |
| NDT file extension | NEPLAN | NEPLAN External Program Import Or Export |
| NDV file extension | Exelis Visual Information Solutions | ENVI N-D Visualizer State |
| NEPPRJ file extension | NEPLAN | NEPLAN Project |
| NET file extension | FileMaker | FileMaker Pro Networking Module Format |
| NETKIT file extension | The GNOME Project | Gnome Desktop |
| NETRC file extension | IBM | .netrc TCP/IP Settings |
| NEULICENSE file extension | Elegant Chaos | Neu License |
| NEX file extension | N/A | Neuroexplorer Neurological Data |
| NFG file extension | Gambit Project | Gambit Normal Form Representation |
| NFS file extension | N/A | Network Format System Temporary Format |
| NFT file extension | NetObjects Inc. | NetObjects Fusion System |
| NFX file extension | NetObjects Inc. | NetObjects Fusion Components Bbscomp |
| NGO file extension | Brøderbund Software, Inc. | Nick-O-Matic Design Factory Project |
| NGR file extension | NEPLAN | NEPLAN Graphic Data |
| NGS file extension | Next Generation Security Software Ltd (NGS) | NGSSniff |
| NHA file extension | HIMSA | Native Noah Format |
| NHP file extension | N/A | NOAA Hydrophone Data |
| NI file extension | NetObjects Inc. | NetObjects Fusion Preview |
| NICK file extension | Microsoft | Microsoft Outlook Nickname Format |
| NICNT file extension | Native Instruments, Inc. | Native Instruments KONTAKT Library |
| NICRASH file extension | Native Instruments, Inc. | TRAKTOR Crash Report |
| NID file extension | Nikon Corporation | Nikon Capture IPTC Data |
| NIL file extension | Ilgam Zulkorneev | QIP |
| NIX file extension | IBM | Rational XDE |
| NJB file extension | Nikon | Nikon Digital SLR Camera Image Index Format |
| NJF file extension | N/A | IBM Lotus Domino |
| NK2 file extension | Microsoft | Microsoft Outlook Contacts AutoComplete Format |
| NKD file extension | Nikon Corporation | Nikon ViewNX Thumbnail Cache |
| NKR file extension | Native Instruments, Inc. | KONTAKT Resource Container |
| NL2 file extension | eSignal | ESignal Market Depth |
| NLG file extension | Martin Freij | Nestopia Language |
| NLK file extension | N/A | Outlook 2003 E-mail Cookie |
| NLR file extension | N/A | NLREG Nonlinear Regression Control |
| NLV file extension | Nikon Corporation | Nikon Capture LCHE Editor |
| NMI file extension | StudyLamp Software LLC | SwordSearcher |
| NMO file extension | Dassault Systèmes S.A. | Virtools Behavioral Objects |
| NMR file extension | Acorn NMR Inc. | WxNUTS Histogram |
| NMS file extension | NuMega | Numega SoftICE Loader File Including Debugging Info |
| NMSV file extension | Ableton AG | Ableton Live Massive Plugin Preset |
| NMU file extension | EMC Corporation | EMC Documentum Client Library Query Cache |
| NMV file extension | Quietust | Nintendulator Movie Capture |
| NMW file extension | Microsoft Corporation | Microsoft NetMeeting T126_Whiteboard |
| NNTP file extension | Simon Fraser | NewsWatcher |
| NNVS file extension | NextNine Ltd. | NextNine VNC Player VNC Session |
| NNW file extension | NeuralWare | NeuralWare NeuralWorks |
| NODES file extension | PowerFolder | PowerFolder Nodes |
| NOMEDIA file extension | N/A | Google Android OS System Format |
| NOTX file extension | Rick Meyers | E-Sword Study |
| NOV file extension | Native Instruments, Inc. | NI Battery Cache |
| NOX file extension | Ricardo plc. | Wave IRIS NOx |
| NPA file extension | ReliaSoft Corporation | ReliaSoft Weibull++ |
| NPC file extension | Intuit Inc. | QuickBooks Online Banking |
| NPD file extension | GJPSOFT.com | Ultra Network Sniffer Captured Packet |
| NPG file extension | Perion Network Ltd. | Magentic Download |
| NPK file extension | n-Track | N-Track Studio Peak |
| NPM file extension | Corel Corporation | CorelDRAW 10 Draw Media Lines |
| NPO file extension | Kostas lab | Nonpareil Redundancy Summary |
| NPW file extension | Nikola Dachev | NPassword |
| NPX file extension | NorPix Inc. | TroublePix Licence |
| NPZ file extension | INCA Internet Co, Ltd. | GameGuard Update |
| NQA file extension | STATCON | NQuery Advisor Data |
| NQF file extension | N/A | NOD32 Quarantine |
| NQI file extension | N/A | NOD32 Quarantine |
| NQST file extension | Adobe Systems Incorporated | SoundEdit |
| NRE file extension | Nero AG | Nero CD EXTRA Compilation |
| NRF file extension | IBM | IBM Domino Notes Redirection |
| NRJ file extension | N/A | Nero JukeBox Compilation |
| NRX file extension | The Neat Company | NeatReceipts SCANALIZER Expense Report |
| NS file extension | Procedimientos-Uno, S.L. | NSwin Project |
| NS1 file extension | Marius Milner | NetStumbler NS1 Log |
| NSG file extension | Nessie Team | Nessie NES Emulator |
| NSLLOC file extension | Apple, Inc. | Apple Mac OS X Finder NSL Internet Location |
| NSPL file extension | AOL Inc. | Netscape Navigator Plugin |
| NSS file extension | IncrediMail | Magentic Screensaver Format |
| NSZ file extension | NVIDIA Corporation | Benchmark Data File Used By NVidia NTune Tool |
| NTD file extension | NinjaTrader, LLC | NinjaTrader |
| NTF file extension | NEATO | MediaFACE CD Label Format |
| NTH file extension | Nokia | Nokia Series 40 And 60 Theme Format |
| NTT file extension | NEATO | MediaFACE Template |
| NTV file extension | Autometrix | PatternSmith Import |
| NTW file extension | SYSTEMS EUROPE | Low Voltage Networks Analysis |
| NTZ file extension | NetZ Computing | InVircible Antivirus Directory Integrity Information |
| NUB file extension | XEROX CORPORATION | Xerox FreeFlow NUB Init |
| NUC file extension | Ziheng Yang | PAML Data |
| NUD file extension | N/A | Now Up-To-Date Calendar Data |
| NUF file extension | Symantec Corporation | Procomm Plus New User Message |
| NUGG file extension | SAP AG | SAP Generated Nugg |
| NUM file extension | Diction Software | Diction |
| NUP file extension | ESET | ESET Nod32 Antivirus Update Format |
| NVD file extension | Savannah | Navidoc |
| NVI file extension | NVIDIA | NVidia Graphics Card Driver Settings Format |
| NVJ file extension | Afreet Software Inc. | Net Vampire Job |
| NVP file extension | Afreet Software Inc. | Net Vampire Job |
| NVR file extension | National Creative Registry, Inc. | NeverForget |
| NVT file extension | N/A | NeuraLynx Video Tracker |
| NVX file extension | Novel CAE Solutions | NvStructural Extension |
| NVZ file extension | visualnovelty.com | Novelty Actor |
| NW3 file extension | Novell, Inc. | Novell Netware.3x |
| NW4 file extension | Novell, Inc. | Netware.4x |
| NWELICENSE file extension | Nisus Software, Inc. | Nisus Writer Pro License |
| NWM file extension | N/A | Sony NWM Display Screen Format |
| NWP file extension | IncrediMail | Magentic Content Format |
| NWUT file extension | Novell, Inc. | NetWare Tools |
| NXB file extension | Nexus Marine AB | Nexus Race Software Raw Data |
| NXN file extension | Avid Technology, Inc. | Avid Interplay Permanent License |
| NY file extension | N/A | Nyquist Plug-in Format |
| NZL file extension | Corel Corporation | Corel Painter Nozzle |
| NZN file extension | N/A | RMCProfile List |
| O8O file extension | N/A | Mediator 5 Repository Tabs Vorlagen.006 |
| OAP file extension | David Pilling | Ovation Pro Applet |
| OAS file extension | rsbr Software | Microsoft Outlook Attachment Sniffer |
| OAW file extension | N/A | OpenArchitectureWare Workflow |
| OB file extension | IBM | IBM LinkWay Object |
| OB! file extension | OrbitDownloader.com | Orbit Downloader Incomplete Download Format |
| OB3 file extension | dmc-ortim | ORTIMzeit Data |
| OBL file extension | Caligari Corporation | TrueSpace |
| OBV file extension | Mootools software | 3D Photo Browser Thumbnail Cache |
| OBX file extension | IBM | Rational XDE |
| OC9 file extension | EcoMerc | OrgCon Organization |
| OCEN file extension | N/A | EdGCM Data |
| OCF file extension | OM2 Technology Inc. | OM2 Cipher |
| OCG file extension | Mount Sinai Hospital | Osprey Custom Graph |
| OCM file extension | AOL Inc. | Netscape Communicator Aim |
| OCP file extension | Zylox Software, Inc. | Offline Commander Project |
| OCV file extension | N/A | OCV Training Data |
| ODCNEWFILE file extension | Microsoft Corporation | Microsoft Office Data Connection |
| ODCTABLEFILE file extension | Microsoft Corporation | Microsoft Office |
| ODE file extension | Microsoft Corporation | Microsoft Office |
| ODF file extension | Sun Microsystems | Open Document Interchange Format (ODIF) |
| ODS file extension | Microsoft | Microsoft Outlook Express Mailbox Format |
| ODTPC file extension | Oracle Corporation | Oracle User Productivity Kit Presentation |
| ODV file extension | N/A | Ocean Data View Data |
| ODVI file extension | N/A | LaTeX |
| OEACCAOUNT file extension | Microsoft Corporation | Windows Mail |
| OEF file extension | IBM | Optim Export |
| OEMIGACCOUNT file extension | Microsoft Corporation | Outlook Express Temporary |
| OET file extension | eSignal | ESignal Order Entry Ticket |
| OEX file extension | Opera Software | Opera Add-on Format |
| OFA file extension | Eastman Kodak Company | Kodak OfotoNow |
| OFD file extension | Cypresslogic Systems Inc. | ObjectView Form Definition |
| OFFSETS file extension | N/A | Offset |
| OFN file extension | Microsoft Corporation | Systems Management Server Offer Creation Notification |
| OFP file extension | Objecteering Software | Objecteering Project |
| OFR file extension | Microsoft | Systems Management Server (SMS) Offer Description Format |
| OGO file extension | N/A | Origin Graphic Object |
| OH4 file extension | Efka-Soft | Overhoor List |
| OHP file extension | Microsoft Corporation | MS-DOS 7 |
| OHS file extension | RAD Game Tools, Inc. | Bink Outbound History |
| OK file extension | Robelle | QEDIT |
| OKX file extension | Mike Mardesich | OKScript |
| OLB file extension | Microsoft | Microsoft Office OLE Object Library Format |
| OLB2 file extension | Abbot Systems | CanOpener Library |
| OLF file extension | Oyez Legal Software | OyezForms Legal Documents |
| OLK14FOLDER file extension | Microsoft Corporation | Microsoft Outlook 2011 For Mac Folder |
| OLK14MSGATTACH file extension | Microsoft Corporation | Microsoft Outlook 2011 For Mac Message Attachment |
| OLK14RECENT file extension | Microsoft Corporation | Microsoft Outlook 2011 For Mac Recent Address |
| OLK14SCHEDULE file extension | Microsoft Corporation | Microsoft Outlook 2011 For Mac Schedule |
| OLK14SEARCH file extension | Microsoft Corporation | Microsoft Outlook 2011 For Mac Saved Search |
| OLK14UID file extension | Microsoft Corporation | Microsoft Outlook 2011 For Mac UID |
| OLN file extension | Microsoft Corporation | Microsoft Visual C++ Outline Examples |
| OLS file extension | Microsoft Corporation | Microsoft Office List Shortcut |
| OLY file extension | IBM | AFP Advanced Function Presentation Overlay Resource |
| OMC file extension | Microsoft Corporation | Microsoft System Center Operations Manager Console |
| OMEG file extension | Wolfram Research, Inc. | Mathematica For Mac |
| OMR file extension | Abhinav Parihar | OMR Template |
| OMS file extension | Briggs Softworks | Order Maven |
| OMT file extension | Open Channel Software | SITH HLA Object Model Template |
| ON2 file extension | N/A | On2 Encoded FLV |
| ONECACHE file extension | Microsoft Corporation | Microsoft OneNote Cache |
| ONETMP file extension | Microsoft Corporation | Microsoft OneNote Temporary |
| ONETOC file extension | Microsoft Corporation | Microsoft OneNote Table Of Contents |
| ONW file extension | Omron Corporation | Omron HMI NTST |
| OOK file extension | Arachne | Arachne Batch Script Format |
| OP file extension | eSignal | ESignal OptionsPlus |
| OP4 file extension | MSC Software Corporation | Nastran Output |
| OPC file extension | Omron Corporation | Omron OPC Client |
| OPDOWNLOAD file extension | Opera Software | Opera Next Incomplete Download |
| OPF file extension | IDPF | Open Packaging Format |
| OPI file extension | Adlib Software | Adlib OCR Processing Information |
| OPP file extension | Kerensoft | IPhotoDVD |
| OPR file extension | OPRO Japan Co.,Ltd. | OPRO X Browser |
| OP_ file extension | GkWare e.K. | GKSetup Support |
| OR8 file extension | IBM | Rational Rose Oracle8 Database Model Report |
| ORG2+ file extension | IBM | Lotus Organizer |
| ORIGINAL file extension | NetObjects Inc. | Netobjects Fusion Components Bbscomp Message |
| ORMDESIGNER file extension | Inventic s.r.o. | ORM Designer Project |
| OS3 file extension | IBM | OS/2 Warp 3 |
| OSA file extension | N/A | W32/Sober-AD |
| OSAX file extension | Apple | AppleScript Scripting Addition |
| OSD file extension | Microsoft Corporation | Open Software Description |
| OSF file extension | MetaCommunications | Virtual Ticket |
| OSL file extension | Ockam Instruments, Inc. | OckamSoft Log |
| OST file extension | Microsoft | Microsoft Outlook Inbox Off-line Folder Format |
| OSW file extension | Keisokugiken corporation | ONESWING Contents |
| OTC file extension | OASIS | OpenDocument Chart Template Format |
| OTF file extension | Oracle | OpenOffice OpenDocument Formula Template |
| OTR file extension | Silicon Graphics, Inc. | IRIX Complied FTR |
| OUTLINE file extension | Neuber Software | FontTwister Letter Outline |
| OUX file extension | Olle Persson | Bibexcel |
| OV file extension | Insperity, Inc. | OrgPlus OrgViewer |
| OVD file extension | Borland Software Corporation | ObjectVision Data |
| OVOLOG file extension | ooVoo LLC | OoVoo Log |
| OWG file extension | OutWit Technologies | OutWit Hub OutWit Gear Outwit Thesaurus Db Format |
| OWM file extension | OutWit Technologies | OutWit Hub OutWit Mashup XML Format |
| OWT file extension | Ancestry.com Inc. | Ancestry.com OneWorldTree |
| OXD file extension | N/A | PS3 Proxy Server |
| OXF file extension | N/A | IBM Rational Rhapsody |
| OXT file extension | Sun Microsystems | OpenOffice.org Extension Help Format |
| OYZ file extension | dataBased Intelligence, Inc. | Lotus Approach Alternate DBASE Index |
| OZP file extension | Orgadata AG | Orgadata LogiKal |
| P00 file extension | Peter B. Clements | PAR Recovery Volume |
| P02 file extension | Peter B. Clements | PAR Recovery Volume |
| P03 file extension | Peter B. Clements | PAR Recovery Volume |
| P04 file extension | Peter B. Clements | PAR Recovery Volume |
| P05 file extension | Peter B. Clements | PAR Recovery Volume |
| P06 file extension | SourceForge.net | Parity Archive Volume Set |
| P07 file extension | Peter B. Clements | PAR Recovery Volume |
| P08 file extension | Peter B. Clements | PAR Recovery Volume |
| P09 file extension | Peter B. Clements | PAR Recovery Volume |
| P10 file extension | N/A | Certificate Request Format |
| P11 file extension | Peter B. Clements | PAR Recovery Volume |
| P14 file extension | Peter B. Clements | PAR Recovery Volume |
| P19 file extension | Peter B. Clements | PAR Recovery Volume |
| P1I file extension | IBM | IBM Voice Type Languages Newuser |
| P20 file extension | Peter B. Clements | PAR Recovery Volume |
| P25 file extension | Peter B. Clements | PAR Recovery Volume |
| P2A file extension | IBM | IBM Voice Type Languages Vocables |
| P2C file extension | IBM | IBM Voice Type Languages Newuser |
| P2F file extension | WAMIT, Inc. | Wamit |
| P2KC file extension | PK2Tools | P2KTools Mod |
| P2P file extension | Microsoft | Microsoft FolderShare Format |
| P30 file extension | Peter B. Clements | PAR Recovery Volume |
| P3C file extension | IBM | IBM Voice Type Languages Newuser |
| P3I file extension | Tech4Learning, Inc. | Pixie |
| P7R file extension | N/A | Response To A Security Certificate Request Format |
| PA2M file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Alignment |
| PA3 file extension | Embarcadero Technologies, Inc. | Turbo Pascal DOS |
| PA4 file extension | Embarcadero Technologies, Inc. | Turbo Pascal Dos |
| PA5 file extension | N/A | Turbo Pascal Dos |
| PAA file extension | The Church of Jesus Christ of Latter-day Saints | PAF Personal Ancestral File Data |
| PAD file extension | The Sage Group | ACT! Database Pointer Format |
| PAF2 file extension | Texas Instruments Inc. | Code Composer Studio Compiled |
| PAKM file extension | Janki Software | PAKM Package Format |
| PAM file extension | PAM Software (UK) Ltd | PAM Property Appraisal Manager Project |
| PAMP file extension | Poweramp | PowerAMP Album Art Format |
| PANDO file extension | N/A | Pando Package Format |
| PAO file extension | Xilinx, Inc. | Xilinx Source List |
| PAP file extension | Corel | Corel Painter Paper Texture Format |
| PAR3 file extension | SourceForge.net | PAR3 Recovery Volume |
| PART file extension | N/A | Partial Download Format |
| PART1 file extension | NetObjects Inc. | NetObjects Fusion System |
| PART2 file extension | NetObjects Inc. | NetObjects Fusion System |
| PART3 file extension | NetObjects Inc. | NetObjects Fusion System |
| PART4 file extension | NetObjects Inc. | NetObjects Fusion System |
| PART5 file extension | NetObjects Inc. | NetObjects Fusion System |
| PARTIAL file extension | Microsoft | Microsoft Internet Explorer 9 Partial Download Format |
| PATCH file extension | N/A | Patch |
| PAUX file extension | N/A | PlasTeX |
| PAV file extension | Panda Security | Panda Antivirus |
| PB1 file extension | Brøderbund Software, Inc. | Broderbund 3D Home Architect |
| PBA file extension | Oracle | OpenOffice.org Basic Protected Module Format |
| PBC file extension | Parrot Foundation | Parrot Compiled Byte Code |
| PBE file extension | Crownhill Associates Limited | Proton Plus Compiler |
| PBH file extension | PowerBASIC, Inc. | PowerBasic Help |
| PBL file extension | Soho Soho | Publitor Data |
| PBR file extension | Sybase Inc. | PowerBuilder Resource |
| PBU file extension | PowerBASIC, Inc. | PowerBASIC Unit |
| PCBDOC file extension | N/A | Printed Circuit Board Description |
| PCMI file extension | ABB Group | ABB PCM600 Pre-configured IED |
| PCMP file extension | ABB Group | ABB PCM600 Project |
| PCMT file extension | ABB Group | ABB PCM600 Template IED |
| PCQ file extension | N/A | Pfaff Embroidery |
| PD3 file extension | Autodesk, Inc. | 3D Studio Max |
| PD6 file extension | Intuit Inc. | Lacerte Tax |
| PDA file extension | Brøderbund Software, Inc. | Image Print Shop Deluxe |
| PDBX file extension | Accelrys Software Inc. | Insight II X-PLOR Coordinate Format |
| PDOC file extension | Richard Hughey - Kevin Karplus - Anders Krogh | Grabdp |
| PDT file extension | General Electric Company | VersaPro Compiled Block |
| PDV file extension | SmartWare Corporation | SmartWare Printer Driver |
| PDVR file extension | Apple, Inc. | QuickDraw GX |
| PE file extension | Inventorprise | PatentEase |
| PED file extension | Corel Corporation | Corel WordPerfect Program Editor Delete Save |
| PEE file extension | The Sage Group plc | Sage Timberline Estimating |
| PEL file extension | IBM | IBM Forms Log |
| PEQ file extension | Corel Corporation | Corel WordPerfect Program Editor Print Queue |
| PERSPECTIVE file extension | Apple, Inc. | Xcode Project Related |
| PERSPECTIVEV3 file extension | Apple, Inc. | Xcode Project Related |
| PES file extension | N/A | Brother Embroidery File Format |
| PF3 file extension | SmartWare Corporation | SmartWare Project Source Code |
| PFL file extension | N/A | PhotoFiltre Plug-in Format |
| PFO file extension | Pismo Technic Inc. | Pismo File Mount Audit Package |
| PFT file extension | Corel Corporation | Corel WordPerfect Temporary |
| PG file extension | eSignal | ESignal Page |
| PGA file extension | Just Great Software Co. Ltd. | PowerGREP Action |
| PGDATA file extension | Penguin George | URL Melter Data |
| PGL file extension | Just Great Software Co. Ltd. | PowerGREP Library |
| PGP file extension | PGP | Pretty Good Privacy Encrypted Format |
| PGR file extension | N/A | PowerGREP Results |
| PGS file extension | Verint Systems Inc. | Verint Quality Monitoring In Progress Data |
| PHC file extension | David Harris | Pegasus Mail Header Cache |
| PHI file extension | Jon A. Christopher | SPOCK PhiMap |
| PHJ file extension | AccurateCNC,Inc. | PhCNC Project |
| PHP2 file extension | The PHP Group | PHP Version 2 Script (HyperText PreProcessor) |
| PHS file extension | Xtalview | XtalView Phase |
| PHV file extension | Husqvarna Viking | Husqvarna Viking Data |
| PHW file extension | Media Lab, Inc. | PhotoWebber Session |
| PI$ file extension | N/A | Microsoft Compressed PIF |
| PIA file extension | PanaVue Inc. | PanaVue ImageAssembler |
| PID file extension | N/A | Unix Process ID Format |
| PIDB file extension | MonoDevelop | Parser Information Database |
| PIK file extension | N/A | Protel 99 PIK |
| PIL file extension | CMA Microdialysis AB | CMA Microdialysis Trend Data |
| PIMX file extension | Adobe Systems Incorporated | Adobe Photoshop |
| PINSTALL file extension | Google Inc. | Google Picasa |
| PIPL file extension | Adobe Systems Incorporated | Adobe Photoshop SDK Samplecode Colorpicker |
| PIQ file extension | Queensgate Systems Ltd | Piped Technology Information Query |
| PIQT file extension | Apple, Inc. | Apple QuickTime Still |
| PJ4 file extension | Electric Quilt | Electric Quilt |
| PJB file extension | IBM | IBM InfoSphere Information Server Manager |
| PJC file extension | Wholly Genes, Inc. | Master Genealogist |
| PJD file extension | Extensis a division of Celartem, Inc. | Portfolio Exported Categories |
| PJF file extension | N/A | IAddress Postal Job |
| PJL file extension | N/A | ProCite Term Lists And Journal Title Lists |
| PJR file extension | labDV | DVDx Project |
| PKD file extension | DOBLON | Power Karaoke Project |
| PKGUNDEF file extension | Microsoft Corporation | Microsoft Visual Studio Shell |
| PKGX file extension | Microsoft Corporation | Configuration Manager Prestage Content |
| PKL file extension | Microsoft Corporation | Exchange Migration Wizard Packing |
| PKP file extension | SelinSoft | Privacy Killer Plug-in Manager |
| PKPASS file extension | Apple | Apple Passbook Pass Format |
| PKX file extension | IBM | Rational XDE |
| PKY file extension | DejaVu Software, Inc | PockeTTY Security Certificate |
| PL3 file extension | Harvard Graphics | Harvard Chart Palette |
| PLA file extension | iriver | Iriver IQuickList Playlist Format |
| PLANTUML file extension | SourceForge.net | PlantUML |
| PLAYSET file extension | Souptoys | Souptoys Playset Format |
| PLB file extension | Microsoft Corporation | FoxPro Library |
| PLD file extension | Patchou | Microsoft Messenger Plus Backup Configuration |
| PLEXAPP file extension | Plex Media Center Team | Plex Package |
| PLF file extension | Papyrus Software | Papyrus License Format |
| PLG file extension | Avid Technology | Sibelius Plug-in Format |
| PLGX file extension | Dominik Reichl | KeePass Optional Plugin Format |
| PLIB file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Dirichlet Mixture Prior Library |
| PLJ file extension | Nirvana Technologies Pvt. Ltd. | Plus 2D Job |
| PLL file extension | Grafx Software Development Tools | CA Clipper 5 Prelinked Library |
| PLN file extension | N/A | Adobe InDesign Plugin Format |
| PLP file extension | Patchou | Messenger Plus! Sound Pack |
| PLQ file extension | K&K Associates | TAK 2000 Heat Rate Plot |
| PLSK file extension | Patchou | Microsoft Windows Live Messenger Skin Pack |
| PLUGIN file extension | N/A | Plugin Format |
| PM! file extension | David Harris | Pegasus Mail Address Book |
| PM$ file extension | David Harris | Pegasus Mail Temporary |
| PM2 file extension | David Harris | Pegasus Mail Uid Information |
| PM5F file extension | Adobe Systems Incorporated | Adobe PageMaker For Mac |
| PMA file extension | Microsoft Corporation | Microsoft Windows Performance Monitor Data |
| PMB file extension | David Harris | Pegasus Mail Addressbook |
| PMDH file extension | David Harris | Pegasus Mail For Mac |
| PME file extension | David Harris | Pegasus Mail Filter Rule Files |
| PMI file extension | IBM | OS/2 Program Manager Information |
| PMJX file extension | N/A | 3D Digital Scanner |
| PMN file extension | David Harris | Pegasus Mail Annotation |
| PMS file extension | David Harris | Pegasus Mail Signature |
| PMT file extension | Eos Systems Inc. | PhotoModeler Lite Tutorials |
| PMU file extension | David Harris | Pegasus Mail Keyboard Macro |
| PMW file extension | David Harris | Pegasus Mail Draft Stored Outgoing Message |
| PN file extension | Powernoodle | Powernoodle Format |
| PNC file extension | IBM | IBM Voice Type Languages Scripts Data |
| PNC1 file extension | Symantec Corporation | Norton Utilities |
| PND file extension | Grassland, Soil & Water Research Laboratory | SWAT Pond Input |
| PNDD file extension | Symantec Corporation | Norton Disk Doctor |
| PNDE file extension | N/A | Norton Utilities |
| PNFD file extension | Symantec Corporation | Norton FileSaver Data |
| PNFV file extension | Symantec Corporation | Norton FileSaver Volume |
| PNFX file extension | Symantec Corporation | Norton FileSaver |
| PNH file extension | Adobe Systems Incorporated | Project ROME Plug-in Archive |
| PNL file extension | Missler Software | TopSolid Nesting Module |
| PNNU file extension | Symantec Corporation | Norton Utilities |
| PNQ file extension | ICQ LLC | ICQ Ifile |
| PNRA file extension | RealNetworks, Inc. | RealPlayer Filente Fippra |
| PNRM file extension | RealNetworks, Inc. | RealPlayer For Mac |
| PNSD file extension | Symantec Corporation | Norton Speed Disk |
| PNUE file extension | Symantec Corporation | Norton UnErase |
| PNV file extension | David Harris | Pegasus Mail Stored Searches |
| PNWI file extension | Symantec Corporation | Norton Wipe Info |
| PNX file extension | David Harris | Pegasus Mail RTF Version Of Queued And Draft Message |
| PNZ file extension | N/A | Panorama Database Set Format |
| POB file extension | Actuate Corporation | Actuate E.Report Persistent Object |
| POLY file extension | N/A | RMCProfile |
| POLYS file extension | M.Carson | Ribbons Polys |
| POW file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Power Curve |
| POX file extension | ASA Astrosysteme GmbH | Autoslew Sequence |
| PPA file extension | Microsoft | Microsoft PowerPoint 97 To 2003 Add-in Format |
| PPAM file extension | N/A | Microsoft PowerPoint 2007/2010 Macro-enabled Open XML Add-in Format |
| PPB file extension | Corel Corporation | Corel WordPerfect Print Preview Button Bar |
| PPE file extension | GSC Game World | S.T.A.L.K.E.R. Post-process Effector |
| PPF file extension | N/A | Corel PaintShop Photo Pro Soft Plastic Preset Data |
| PPK file extension | PuTTY | PuTTY Win32 Telnet/SSH Client Private Key Format |
| PPLZ file extension | Polar Electro | Polar ProTrainer Training Plan |
| PPMOD file extension | Lucas Pope | Papers, Please Mod Format |
| PPM_B file extension | Nokia | Nokia PPM Flash Format |
| PQ file extension | Adobe Systems Incorporated | Adobe Pagemaker Default Printer Style |
| PQA file extension | Novell, Inc. | Query Application |
| PQE file extension | Kroll Ontrack Inc. | Ontrack EasyRecovery Recovered Data |
| PQF file extension | Corel Corporation | Corel Presentations Runtime |
| PQO file extension | U.S. Geological Survey | PhreeqcI |
| PQW file extension | Corel Corporation | Corel Presentations Runtime |
| PQX file extension | PowerQuest | Power Quest Drive Image Index |
| PR file extension | N/A | W32/Brontok-DP Worm |
| PR0 file extension | CheckMark Software Inc. | CheckMark Payroll Software Company Information |
| PR1 file extension | Polaris Software | Packrat 4.0 Data |
| PR2 file extension | CheckMark Software Inc. | CheckMark Payroll Software Employee Checks |
| PR3 file extension | N/A | DBASE IV PostScript Printer Driver |
| PR4 file extension | CheckMark Software Inc. | CheckMark Payroll Software Employer Checks |
| PR5 file extension | CheckMark Software Inc. | CheckMark Payroll Distribution |
| PRETTY file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Prettyalign Output |
| PREVIEW7 file extension | Stardock Corporation | WindowBlinds Temporary |
| PRH file extension | N/A | Macromedia ColdFusion Studio Project |
| PRJPCB file extension | Altium Limited. | Altium Designer Project |
| PRL file extension | Silicon Mindset Inc. | Process Revolution Object Library |
| PRM file extension | N/A | Adobe Premiere Plug-in Format |
| PRMDC file extension | Adobe Systems Incorporated | Adobe Premiere Pro Metadata Cache |
| PRMR file extension | Adobe Systems Incorporated | Adobe Premiere For Mac |
| PROCPS file extension | The GNOME Project | Gnome Desktop |
| PROJ file extension | Apple, Inc. | Apple NeXT Interface Builder Project |
| PROJDATA file extension | Microsoft Corporation | Microsoft Visual C# Project Data |
| PROOFINGTOOL file extension | Microsoft Corporation | Microsoft Office Proofing Tool |
| PRQ file extension | Flexera Software, Inc. | InstallShield Prerequisite |
| PRS file extension | Sony | Sony PlayStation 3 Radio Player Location Format |
| PRTC file extension | Nuance Communications, Inc. | OmniPage |
| PRU file extension | IBM | IBM Tivoli Storage Manager Pruned Entry |
| PS2XML file extension | Microsoft Corporation | Windows PowerShell |
| PS7 file extension | Corel Corporation | Corel PaintShop Photo Pro |
| PSAR file extension | Sony | Sony PlayStation Portable Update Data Format |
| PSC file extension | Manitoba HVDC Research Centre Inc. | PSCAD Power System Simulation Software Case |
| PSCX file extension | Manitoba HVDC Research Centre Inc. | PSCAD Power System Simulation Software XML Case |
| PSDOWNLOAD file extension | Apple, Inc. | Apple Mac OS X PubSub Agent Enclosure Download |
| PSET file extension | Adobe Systems | Adobe InDesign Format |
| PSI file extension | Sapien Technologies | PrimalScript Online Help Shortcut Format |
| PSL file extension | Manitoba HVDC Research Centre Inc. | PSCAD Power System Simulation Library |
| PSLC file extension | Patchou | Messenger Plus! Packaged Scripts |
| PSLX file extension | Manitoba HVDC Research Centre Inc. | PSCAD Power System Simulation Software XML Library |
| PSMODEL file extension | Delcam plc | Delcam Powershape |
| PSOD file extension | Roxio | Roxio Easy Media Creator Album |
| PSPDEFORMATIONMAP file extension | Corel Corporation | PaintShop Pro Deformation Map |
| PSPENVIROMENTMAP file extension | Corel Corporation | PaintShop Pro Environment Map |
| PSPGRADIENT file extension | Corel Corporation | PaintShop Pro Gradient |
| PSPROJ file extension | PyScripter team | PyScripter Project |
| PSPSELECTION file extension | Corel Corporation | PaintShop Pro Saved Selection |
| PSPSHAPE file extension | Corel Corporation | Paint Shop Pro Shape |
| PSPSTYLEDLINE file extension | Corel Corporation | PaintShop Pro Styled Line |
| PSPT file extension | Apple, Inc. | Apple File Exchange |
| PSQL file extension | Areski | AreskiCC |
| PSS file extension | N/A | Picture And Sound Show Format |
| PSW file extension | Microsoft | Microsoft Windows XP/Vista Backup Password Format |
| PT file extension | The Panther Team | Panther Project Format |
| PT3 file extension | N/A | Harvard Device Driver |
| PT4 file extension | Avid Technology, Inc. | Pro Tools 4 (16 Bit) Session |
| PT5 file extension | Avid Technology, Inc. | Pro Tools 5 Session |
| PTC file extension | N/A | ABBYY Finereader 5.0 Pro |
| PTD file extension | Parametric Technology Corporation | Pro/ENGINEER Table |
| PTDB file extension | The Sage Group plc | Peachtree Accounting Data |
| PTE file extension | WnSoft | PicturesToExe Project |
| PTH file extension | N/A | 4th Dimension Database Windows Pathname Document |
| PTN2 file extension | Nuance Communications, Inc. | PaperPort Thumbnail Cache |
| PTP file extension | N/A | Docklight Project |
| PTQ file extension | MODARTT | Pianoteq Extension |
| PTR file extension | N/A | TrendyFlash Desktop Flash Intro Project Format |
| PTRACK file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Predict_track |
| PTTS file extension | National Laboratory of Pattern Recognition | CASIA-OLHWDB Page |
| PTV file extension | CodeJam | MemoriesOnTV Photo Slide Show Project |
| PU file extension | SourceForge.net | PlantUML |
| PV file extension | N/A | CONSEL Output P-Value |
| PVF file extension | Authentica, Inc. | PageRecall |
| PVG file extension | Microsoft Corporation | Encarta World Atlas Pushpins |
| PVI file extension | Intergraph Corporation | PV Elite Pressure Vessel Analysis |
| PVK file extension | Microsoft | Private Key Format |
| PVM file extension | Hewlett-Packard | HP Photo Album |
| PVN file extension | Avanquest Software | Desing & Print Business Edition |
| PVTP file extension | Kitware, Inc. | ParaView Visualization Toolkit Parallel Polygonal Data |
| PVTR file extension | Kitware, Inc. | Visualization Toolkit Parallel Rectilinear Grid Data |
| PVTS file extension | Kitware, Inc. | Visualization Toolkit Parallel Structured Points Data |
| PVTU file extension | Kitware, Inc. | ParaView Visualization Toolkit Parallel Unstructured Points Data |
| PVU file extension | NOAA | PaleoVu Paleoenvironmental Data |
| PVV file extension | Dynojet Research Inc. | Power Vision WinPV |
| PWK file extension | Gregory Braun | Password Keeper |
| PWM file extension | WebMoney | WM Keeper CLASSIC Purse |
| PWO file extension | Certara | WinNonlin Output |
| PWR file extension | Xilinx, Inc. | XPower Power Report |
| PWRE file extension | LastBit Corp. | PasswordTools Data |
| PWREP file extension | N/A | Password Repository Format |
| PX5 file extension | Poker-Pal | Poker Pal Third-party Extension |
| PXT file extension | N/A | IGOR Pro Packed Experiment Template |
| PXX file extension | Tavultesoft | Encrypted Keyman Customisation |
| PXY file extension | Adtollo | Topocad |
| PYG file extension | IBM | IBM Cognos 7 |
| PYH file extension | IBM | IBM Cognos 7 |
| PYI file extension | IBM | IBM Cognos 7 |
| PYJ file extension | IBM | IBM Cognos 8 |
| PZD file extension | The CAD Zone, Inc. | Pocket Zone Drawing |
| PZF file extension | GraphPad Software, Inc. | GraphPad Prism Project |
| PZM file extension | GraphPad Software, Inc. | GraphPad Prism Project |
| PZO file extension | Application Techniques, Inc. | Pizazz Plus Overlay Data |
| Q00 file extension | Intuit Inc. | Quicken 2000 |
| Q01 file extension | Intuit Inc. | Quicken 2001 |
| Q06 file extension | Intuit Canada Limited | QuickTax 2006 |
| Q1Q file extension | N/A | LunarCell Adobe Photoshop Plug-in Format |
| Q2Q file extension | N/A | Flexify Adobe Photoshop Plug-in Format |
| Q3X file extension | Apple, Inc. | QuickDraw 3D Extension |
| Q4Q file extension | N/A | Solar Cell Adobe Photoshop Plug-in Format |
| Q5R file extension | N/A | Melancholytron Adobe Photoshop Plug-in Format |
| Q7Q file extension | N/A | India Ink Plug-in Format |
| Q8R file extension | N/A | Flood Adobe Photoshop Plug-in Format |
| Q98 file extension | Intuit Inc. | Quicken 98 |
| Q9R file extension | N/A | Glitterato Adobe Photoshop Plug-in Format |
| Q9S file extension | N/A | Mr. Contrast Adobe Photoshop Plug-in Format |
| QAP file extension | TigerLogic Corp. (Omnis Technology Corporation) | Omnis Quartz Application |
| QAR file extension | QlikTech International | QlikView Plug-in Format |
| QB file extension | Wimba, Inc. | Diploma Question |
| QB1 file extension | Intuit Inc. | Quicken Data |
| QB2008 file extension | Intuit Inc. | Quickbook 2009 For Mac Backup |
| QB2013 file extension | Intuit Inc. | QuickBooks 2013 For Mac Backup |
| QBA file extension | Intuit Inc. | QuickBooks Accountant Review Copy |
| QBE file extension | Corel Corporation | Corel Quattro Pro Saved Query |
| QBI file extension | Intuit Inc. | QuickBooks Image |
| QBL file extension | Intuit Inc. | QuickBooks |
| QBR file extension | Intuit Inc. | Quickbooks Report Template |
| QBT file extension | Intuit Inc. | QuicBooks Temporary Rebuild |
| QBY file extension | Intuit Inc. | Quickbooks Accountants Import |
| QCH file extension | Intuit Inc. | Quicken DOS Data |
| QCI file extension | SourceForge.net | Massively Parallel Quantum Chemistry Program |
| QCK file extension | N/A | Jigsaw 2 Astrological Tool |
| QCOW file extension | David T Reynolds | QEMU Copy-On-Write |
| QCOW2 file extension | David T Reynolds | QEMU Copy-On-Write |
| QD3 file extension | N/A | Omnis Quartz Segment 3 Data |
| QD3D file extension | Apple, Inc. | QuickDraw 3D Meta |
| QDI file extension | Intuit Inc. | Quicken Dictionary Data |
| QDLX file extension | Intuit Inc. | Quicken For Mac Data |
| QDM file extension | N/A | FsQCA Data |
| QDS file extension | Microsoft | Windows Directory Query Format |
| QEF file extension | Microsoft Corporation | Microsoft Excel Query |
| QEM file extension | ExpensAble | ExpensAble Report |
| QES file extension | Askia SAS | Askiadesign Questionnaire |
| QEX file extension | ExpensAble | ExpensAble Data |
| QFD file extension | Intuit Inc. | Quicken Data |
| QFI file extension | Intuit Inc. | Quicken 2002 Data |
| QFP file extension | N/A | Quicken Financial Planner Add-on |
| QHF file extension | Ilgam Zulkorneev | QIP Saved History |
| QID file extension | Intuit Inc. | Quicken |
| QIN file extension | SINTEF | CARE-S InfoWorks Inflow |
| QIP file extension | Ilgam Zulkorneev | QIP Infium Account |
| QIX file extension | Intuit Inc. | Quicken DOS Data |
| QKEX file extension | Startly Technologies, LLC. | QuicKeys Mac Extension |
| QKPT file extension | Synergy Software | KaleidaGraph |
| QKR file extension | IBM | Quickr Attachment Link |
| QKT file extension | Microsoft Corporation | Microsoft Works |
| QL file extension | Robelle | QEdit |
| QLB file extension | Microsoft Corporation | Microsoft QuickBasic Library |
| QLC file extension | Adobe Systems Incorporated | Adobe PostScript Help |
| QLD file extension | Waters | MassLynx Quantation Data |
| QLGENERATOR file extension | Apple | Apple Quicklook Plug-in Format |
| QMA file extension | Robelle | Qedit |
| QMB file extension | Matthieu Godon | Quick Menu Builder Saved |
| QMBL file extension | Vernier Software & Technology | LabQuest Results |
| QME file extension | Intuit Inc. | Quicken Win Version 3 |
| QMETHOD file extension | AB SCIEX | AB SCIEX MultiQuant Quantitation Method |
| QML file extension | Intuit Inc. | Quicken DOS Data |
| QMSB file extension | Questionmark | Questionmark Secure |
| QMT file extension | Intuit Inc. | Quicken Memory List |
| QMTF file extension | Intuit Inc. | Intuit Quicken Data |
| QNT file extension | Dionex Corporation | Chromeleon Quantification Method |
| QNX file extension | Intuit Inc. | Quicken Index |
| QOB file extension | Intuit Inc. | QuickBooks 2010 Pro |
| QOT file extension | Sierra Entertainment, Inc. | Sierra Print Artist Quotes |
| QP1 file extension | Peter B. Clements | QuickPar Cache |
| QP2 file extension | Peter B. Clements | QuickPar Cache |
| QPA file extension | Apple, Inc. | Quicktime Player Addition |
| QPC file extension | Synergy Software | KaleidaGraph Plot |
| QPCT file extension | Synergy Software | KaleidaGraph Plot |
| QPD file extension | N/A | Quicken QuickPay Windows 3.0 Add-on |
| QPI file extension | Intuit Inc. | Quicken Win Version 3 |
| QPL file extension | Synergy Software | KaleidaGraph Layout |
| QPROJ file extension | FreeQ Development team | FreeQ IDE Project |
| QPS file extension | QP Software Limited | Timeasure |
| QPX file extension | N/A | Apple QuickTime Player Extension Format |
| QR2 file extension | Embarcadero Technologies, Inc. | Delphi Database Quick Report |
| QRS file extension | Corel Corporation | Corel WordPerfect Equation Editor Support |
| QSESSION file extension | AB SCIEX | AB SCIEX MultiQuant Quantitation Session |
| QSR file extension | SINTEF | CARE-S InfoWorks Water Quality Simulation Results |
| QST file extension | Synergy Software | KaleidaGraph Style |
| QSTY file extension | Synergy Software | KaleidaGraph Style |
| QTB file extension | eInstruction | ExamView QuickTake Question Bank |
| QTR file extension | Apple | Apple QuickTime Extension Resource Format |
| QTV file extension | Apple, Inc. | QuickTime Virtual Reality |
| QTX file extension | Apple | Quicken Data Format |
| QTXS file extension | Apple, Inc. | Apple QuickTime |
| QUA file extension | Avira Operations | Avira AntiVir Format |
| QUALSOFTCODE file extension | J&ASoft | Speedy Browser Code Archive |
| QUE file extension | GlobalSCAPE, Inc. | CuteFTP Queue |
| QUI file extension | Orgadata AG | Orgadata LogiKal |
| QUO file extension | eSignal | ESignal Qoute |
| QUP file extension | Apple, Inc. | QuickTime Update Package |
| QUT file extension | IBM | IBM Voice Type Languages Vocable |
| QW5 file extension | Intuit Inc. | Quicken Win Version 5 |
| QWB file extension | Microsoft Corporation | Microsoft Money Quotes WriteBack Import |
| QWP file extension | Sam Bellotto Jr. | Quiptics Puzzle Format |
| QWQ file extension | OpenQwaq | OpenQwaq Auto-Launch Format |
| QXL file extension | Quark | QuarkXPress Element Library Format |
| QXML file extension | Cincom Systems, Inc. | Question Master Administration Tool Output |
| QZ file extension | PC Shareware, Inc. | Create A Quiz Data |
| QZS file extension | Luzius Schneider | QuizPro Data |
| R*CH file extension | Bare Bones Software | BBEdit |
| R2D file extension | RISA Technologies, LLC. | RISA-2D |
| RAC file extension | Concept2 Inc. | Venue Race Application |
| RADIUMKEY2 file extension | CatPig Studios | Radium Registration Format |
| RAG file extension | Bentley Systems, Incorporated | RAM Advanse Generator |
| RAI file extension | Astronomical Institute of the Academy of Sciences of the Czech Republic | SPEFO |
| RAMD file extension | Apple, Inc. | Repeat After Me Document |
| RAN file extension | Owen F Ransen | Dexterpen |
| RAP file extension | MAGIX AG | Magix Music Studio Rap |
| RASKINLICENSE file extension | Raskin Software | Raskin For Mac License Format |
| RAT file extension | W3C | PICS Platform For Internet Content Selection Format |
| RA_ file extension | Resco, s.r.o. | Resco Photo Viewer Thumbnail Cache |
| RB1 file extension | R:BASE Technologies, Inc. | R:Base Data Format |
| RB2 file extension | R:BASE Technologies, Inc. | R:Base Data Format |
| RB3 file extension | R:BASE Technologies, Inc. | R:BASE Data |
| RBA file extension | Just Great Software Co. Ltd. | RegexBuddy Regular Expression |
| RBG file extension | Just Great Software Co. Ltd. | RegexBuddy GREP Action |
| RBI file extension | Robert Bentley, Inc. | EBahn Reader |
| RBL file extension | Just Great Software Co. Ltd. | RegexBuddy Library |
| RBM file extension | Propellerhead Software AB | Propellerhead ReBirth Modulation V2.0 |
| RBO file extension | REAL Software, Inc. | REALbasic Class |
| RBZ file extension | Trimble | SketchUp Extension |
| RCB file extension | RealityRipple.com | Ripple Chat Bot Document |
| RCH file extension | Grassland, Soil & Water Research Laboratory | SWAT Reach Output |
| RCN file extension | Qstarz International Co, Ltd. | QRacing Track |
| RCV file extension | QUALCOMM Incorporated | Eudora Temporary Download |
| RDAT file extension | N/A | RNA Data (RDAT) |
| RDD file extension | ReliaSoft Corporation | ALTA |
| RDV file extension | Nikolai Teofilov | NTgraph |
| RDY file extension | Teldas GmbH | INet-Server |
| REAL file extension | The GNOME Project | Gnome Desktop |
| REAPEAKS file extension | Cockos Incorporated | REAPER Scratch |
| RECO file extension | Evernote Corporation | Evernote |
| REDIR file extension | Spotify | Spotify Redirect Format |
| REFI file extension | Rick Meyers | E-Sword Reference IOS Notes |
| REFX file extension | Rick Meyers | E-Sword Reference Library Note |
| REGI file extension | Kagi | Kagi Registration Module |
| REGS file extension | AOL Inc. | Netscape Registry |
| REGULARIZER file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Transition Regularizer |
| RELOC file extension | Microsoft | Microsoft Windows EXE Relocation Format |
| REM file extension | Research In Motion | BlackBerry Encrypted Data Format |
| RENDERMAN file extension | Pixar | Pixar RenderMan 3.1 Specification |
| REPX file extension | Developer Express Inc. | XtraReports Report Definition |
| REQ file extension | N/A | SSL Certificate Request Format |
| REW file extension | RWTH Aachen University | MRMC Markov Reward Model Checker Definition |
| REWI file extension | RWTH Aachen University | MRMC Markov Reward Model Checker Definition |
| REZ file extension | Ambrosia | Escape Velocity Nova Plugin Format |
| RF0 file extension | SmartWare Corporation | SmartWare Runtime Project |
| RF2 file extension | SmartWare Corporation | SmartWare Runtime Project |
| RF3 file extension | SmartWare Corporation | SmartWare Runtime Project |
| RF4 file extension | SmartWare Corporation | SmartWare Runtime Project |
| RF5 file extension | Tektronix, Inc. | Tektronix |
| RFB file extension | Siber Systems | RoboForm Bookmarks Format |
| RFC file extension | Siber Systems | RoboForm Contact Format |
| RFE file extension | Institute of Fluid Mechanics and Environmental Physics in Civil Engineering | RockFlow Log |
| RFG file extension | Raddon Financial Group | RFG Integrator System Database |
| RFI file extension | Astronomical Institute of the Academy of Sciences of the Czech Republic | SPEFO Stellar Spectra Analysis |
| RFN file extension | Siber Systems | RoboForm SafeNote Files |
| RFP file extension | Siber Systems | RoboForm Passcard Format |
| RFR file extension | Adobe Systems Incorporated | Adobe Photoshop Frame Filter |
| RFT file extension | Siber Systems | RoboForm Identity Format |
| RFV file extension | N/A | Restricted Focus Viewer Input |
| RFX file extension | Siber Systems, Inc. | RoboForm Blocked Passcard |
| RGF file extension | ElcomSoft Co. Ltd. | Advanced Registry Tracer Scan Data |
| RGU file extension | N/A | Data Recovery Software |
| RHA file extension | Adobe Systems Incorporated | Adobe RoboHelp AIR Help Project |
| RHK file extension | N/A | Backdoor.Win32.Rbot.rhk Trojan Virus |
| RHP file extension | N/A | Rhino 3D Plug-in Format |
| RI file extension | IBM | Lotus 1-2-3 Data |
| RIBBONS file extension | M.Carson | Ribbons |
| RIV file extension | School of Aquatic & Fishery Sciences, University of Washington | CRiSP Harvest |
| RJS file extension | RealNetworks | RealJukebox Skin |
| RJT file extension | RealNetworks, Inc. | RealPlayer Track Info Style |
| RKR file extension | CA Technologies | CA Upgrade Wizard Response |
| RLA file extension | Autodesk, Inc. | 3ds Max Rendered Graphic |
| RLD file extension | Symantec Corporation | Norton Commander Temporary |
| RLG file extension | ReliaSoft Corporation | Weibull++ |
| RLOG file extension | N/A | MPICH Log |
| RLT file extension | ReliaSoft Corporation | ReliaSoft BlockSim & Weibull++ |
| RLX file extension | JustSystems Corp. | XMetaL Compiled Form |
| RM3D file extension | MSCI Inc. | RiskMetrics RiskManager |
| RMC file extension | Washington State Department of Transportation | RMCalc |
| RMDP file extension | Microsoft Studios | Alan Wake Game Data |
| RMG file extension | RootsMagic, Inc. | RootsMagic Genealogy |
| RMGC file extension | RootsMagic, Inc. | RootsMagic Genealogy Database |
| RMK file extension | Grafx Software Development Tools | CA Clipper RMake Makefile |
| RML file extension | Elixir Technology | Elixir Report Template Format |
| RNA file extension | N/A | Malware |
| RND file extension | PGP | PGP (Pretty Good Privacy) Random Seed |
| RNT file extension | Planit | EdgeCAM Licensing Data |
| ROCK file extension | Rockbox | Rockbox Installation Format |
| ROH file extension | N/A | Avantes |
| ROM file extension | N/A | Read Only Memory Image (emulators/AONs) |
| ROV file extension | N/A | Actuate E.Report Designer Report Object Value |
| ROW file extension | Actuate Corporation | Actuate E.Report HTML Report Document |
| ROZ file extension | aSc Applied Software Consultants | ASc TimeTables Timetable |
| RPC file extension | dnSoft Research Group | RAR Password Cracker Project |
| RPE file extension | XStream Software | Performance Analyzer |
| RPI file extension | N/A | Render Extension |
| RPLIB file extension | Axure Software Solutions | Axure Widget Library Format |
| RPLN file extension | Adobe Systems Incorporated | Adobe InDesign Required Function Library |
| RPM file extension | N/A | RealAudio Plugin Format |
| RPMSG file extension | Microsoft | Microsoft Restricted Permission Message Format |
| RPN file extension | Intellicate, Ltd. | Schedule24 Shift Pattern |
| RPO file extension | IBM | IBM XL C/C++ For Linux Compiler |
| RPR file extension | IBM | IBM Voice Type Languages Vocabels |
| RPT2 file extension | eSignal | ESignal Report |
| RPV file extension | RPV Software | RPV Printing System |
| RPW file extension | N/A | RPWiz Project |
| RPX file extension | Geocentrix Ltd. | Repute Tutorial |
| RQC file extension | Micro Focus International plc | Micro Focus Revolve |
| RQM file extension | N/A | IBM RequisitePro Metrics Report |
| RQT file extension | N/A | Report Quality Plotting Module |
| RRG file extension | JRiver, Inc. | JRiver Media Center License |
| RSA file extension | N/A | RSA Digital Certificate Format |
| RSD-JOURNAL file extension | N/A | REALSQLDatabase Journal |
| RSDS file extension | N/A | SharePoint Shared Data Source |
| RSED file extension | http://www.resedit.net/ | ResEdit |
| RSF file extension | Mediafour Corporation | Mediafour MacDrive Macintosh Resource Fork |
| RSFX file extension | Attachmate Corporation | Reflection |
| RSI file extension | Reactive Systems, Inc. | Reactis |
| RSL file extension | Corel Corporation | Corel Paradox Saved Form |
| RSML file extension | RealNetworks, Inc. | RealPlayer ML |
| RSRS file extension | Magic Modules Pty Ltd | Buddy API |
| RS_ file extension | Apple, Inc. | Macintosh Resource Fork |
| RTB file extension | Robert McNeel & Associates | Rhino 3D Toolbar Collection |
| RTC file extension | Microsoft | Microsoft Office Live Meeting Connection Format |
| RTH file extension | ANSYS Inc. | ANSYS Results |
| RTK file extension | Safer-Networking Ltd. | Spybot Search & Destroy |
| RTM file extension | National Instruments | LabVIEW Run-time Menu Format |
| RTN file extension | Optical Gaging Products, Inc. | MeasureMind 3D |
| RTP file extension | N/A | TurboTax Update Format |
| RTR file extension | Fantiusen Software | Astrotite 200X Offline Data Repair |
| RTT file extension | RagTime GmbH | Ragtime |
| RTU file extension | Guru3D.com | RivaTuner Update |
| RT_ file extension | Microsoft Corporation | Microsoft Windows Winhelp Compressed |
| RUJ file extension | Oracle Corporation | Oracle Recovery-Unit Journal |
| RUP file extension | IBM | IBM Rational Unified Process |
| RUS file extension | GPS Moldova | Navitel Navigator Map |
| RV3 file extension | DJI Interprises, LLC | Newsbin Pro |
| RVG file extension | Autodesk, Inc. | Revit External Group |
| RVR file extension | Astronomical Institute of the Academy of Sciences of the Czech Republic | SPEFO Stellar Spectra Analysis |
| RVW file extension | Element River, LLC. | ReviewMate Review |
| RW file extension | PremiumSoft CyberTech Ltd. | Navicat For MySQL |
| RW5 file extension | Spectra Precision | Survey Pro Data |
| RWA file extension | ReliaSoft Corporation | Weibull++ |
| RWC file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Regional Wind Climate |
| RWLIBRARY file extension | Mariner Software | Paperless Receipt Library Format |
| RWO file extension | MathWorks, Inc. | Matlab Output |
| RWPLUGIN file extension | Realmac Softwaree | RapidWeaver Plugin Format |
| RWR file extension | Sonoma Wire Works | RiffWorks IntelliRiffer |
| RWTL file extension | ResearchWare, Inc. | HyperRESEARCH |
| RWX file extension | AOL Inc. | Netscape Live 3D |
| RWZ file extension | Microsoft | Microsoft Outlook Internet Rules Settings Format |
| RX file extension | Radsoft | E3 Security Kit Prescription |
| RXC file extension | Sonic Solutions | Roxio Certificate Format |
| RXD file extension | Attachmate Corporation | Attachmate Reflection X Manager Definition |
| RXM file extension | Attachmate Corporation | Reflection X Multi Session |
| RXPROJ file extension | Enterbrain, Inc. | RPG Maker Project |
| S#+A file extension | RagTime GmbH | RagTime 2 |
| S03 file extension | Corel Corporation | Corel WordPerfect Distribution |
| S07 file extension | Acorah Software Products | TaxCalc 2007 |
| S1P file extension | N/A | Touchstone 1 S-parameter Data |
| S2D file extension | Agilent Technologies | Agilent EEsof EDA S-parameter Data |
| S2MI file extension | Blizzard Entertainment, Inc. | Starcraft 2 Cache |
| S2P file extension | Sonnet Software Inc. | Sonnet S-device Parameter Data |
| S2T file extension | N/A | Scia2Tekla Plugin |
| S31 file extension | TamoSoft | SmartWhois |
| S3P file extension | N/A | Touchstone 9 S-parameters Data |
| S4P file extension | N/A | Touchstone 16 S-parameters Data |
| S7P file extension | N/A | SubSeven Trojan |
| SA2 file extension | Syntap Software | Time Stamp Project Grid Information |
| SA9 file extension | N/A | Hue And Cry Adobe Photoshop Plug-in Format |
| SAFARIEXTZ file extension | Apple | Apple Safari Extension Format |
| SAJ file extension | The Sage Group plc | Sage 50 Folder |
| SAL file extension | Full Information Software, Inc. | SORITEC Data |
| SAMBA3 file extension | The GNOME Project | Gnome Desktop |
| SAMRC file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Default Parameters |
| SAPSSD file extension | N/A | SAP Related |
| SAS7BNDX file extension | SAS Institute Inc. | SAS Index |
| SAVF file extension | Oracle Corporation | AS400Manager JAVA |
| SAY file extension | SayaMatrix | Saya Matrix Accounting Database |
| SB1 file extension | Lasting Impressions for Paper Inc. | MemoryMixer Album |
| SB7 file extension | Lindersoft | SetupBuilder Project |
| SBA file extension | speedbalance.nl | SpeedBalance Accounting Data |
| SBC file extension | Microsoft | Microsoft Office Accounting Company Shortcut Format |
| SBK file extension | Asymetrix | Multimedia ToolBook System Book |
| SBL file extension | Procedimientos-Uno, S.L. | Arquitienda Graphic Symbol Library |
| SBO file extension | SAP AG | SAP Business One SDK Add-on Related |
| SBSTORE file extension | Mozilla Corporation | Mozilla Firefox |
| SC2LOCALE file extension | Blizzard Entertainment | StarCraft 2 Localization Format |
| SCAT file extension | ARM Holdings plc | RealView Scatter-loading |
| SCD file extension | N/A | TurboTax Schedule Descriptions Format |
| SCE file extension | MediaWeb | SoftCuisine Data Exchange |
| SCL file extension | Manuel Op de Coul | Scala Scale |
| SCM file extension | GIMP | GIMP Script Format |
| SCMT file extension | GXS Limited | GXS Application Integrator XML Constraint |
| SCORE file extension | Tribal | Learning Score |
| SCQ file extension | SAS Institute Inc. | SAS Sequential Access |
| SCREEM file extension | David A Knight | SCREEM |
| SCVINFO file extension | Microsoft Corporation | Windows Communication Foundation WCF Metadata |
| SCW file extension | N/A | Score Writer Document Format |
| SCY file extension | OBP RESEARCH | ReaGeniX Security |
| SDBZ file extension | Symantec Corporation | Symantec Support Tool Information |
| SDE file extension | Groundlevel Software, Inc. | Drumbeat Exported Data |
| SDK file extension | Programming Sunrise | Smart Diary Suite Cookbook |
| SDLTM file extension | SDL Tridion | SDL Trados Studio |
| SDMDOCUMENT file extension | Microsoft Corporation | Microsoft SDM Document |
| SDPC file extension | N/A | Cocreate SolidDesigner Data |
| SDY file extension | Star Finanz GmbH | StarMoney |
| SEARCH-MS file extension | Microsoft | Microsoft Windows Index Search Data Format |
| SEC file extension | N/A | Pretty Good Privacy Secret Key Ring Format |
| SECSTORE file extension | Adobe Systems Incorporated | Adobe Secstore |
| SECURE file extension | Septium | Septium Secured Document |
| SECURITY file extension | Oracle Corporation | Javasoft Jre 1.3 Lib Security |
| SEG2 file extension | Smith Micro Software, Inc. | Stuffit Mac File Type |
| SEG3 file extension | Smith Micro Software, Inc. | Stuffit Segment |
| SEGN file extension | Smith Micro Software, Inc. | StuffIt Segment |
| SEPLUGIN file extension | Apple | Apple Mac OS X AppleScript Editor Plugin Format |
| SEQUENCEDIAGRAM file extension | Microsoft Corporation | Microsoft Visual Studio Sequence Diagram |
| SERVER file extension | N/A | Bonobo Activation API |
| SEW file extension | N/A | Home Embroidery Format |
| SF3 file extension | N/A | STATGRAPHICS Data |
| SFA file extension | Sony Corporation | Sony Sound Forge |
| SFM file extension | DARTECH, Inc. | Dart PRO Soundtree Structure |
| SFT file extension | Microsoft | Microsoft App-V Sequencer Format |
| SFV file extension | N/A | Simple File Verification Checksum Format |
| SG file extension | Adrian E. Feiguin | SciGraphica Data |
| SGCPO file extension | Stenograph, L.L.C. | Case CATalyst |
| SGNGL file extension | Stenograph, L.L.C. | Case CATalyst |
| SGO file extension | N/A | ECU Update |
| SGSTN file extension | Stenograph, L.L.C. | Case CATalyst |
| SGX file extension | IBM | IBM Rational XDE |
| SHA file extension | Microsoft Corporation | System Management Server Site Hierarchy Addition |
| SHA1 file extension | N/A | SHA-1 Hash Text Format |
| SHA256 file extension | FileVerifier++ | FileVerifier++ SHA-256 Hashes Format |
| SHA512 file extension | N/A | SHA512 Hash Text Format |
| SHADOWINDEXGROUPS file extension | Apple, Inc. | Mac OS X Spotlight |
| SHADOWINDEXTERMIDS file extension | N/A | Mac OS X Spotlight |
| SHAPE file extension | The Dia Developers | Dia Diagram Editor Shape |
| SHF file extension | PGP Corporation | Pretty Good Privacy (PGP) Share |
| SHFT file extension | Machai Apps | Shift Work Calendar |
| SHLB file extension | Mozilla Corporation | Mozilla |
| SHM file extension | Corel Corporation | Corel WordPerfect Shell Macro Library |
| SHORTCUT file extension | Fanix Software | Asutype Shortcut Format |
| SHUTDOWNSTALL file extension | Apple, Inc. | Mac OS X Log |
| SHV file extension | Husqvarna Viking | Husqvarna Viking Designer 1 Sewing Machine Embroidery Design Format |
| SHX file extension | Motorola | Motorola RAZR Flash Format |
| SIC file extension | Intuit Inc. | Quicken 2002 Order |
| SIDB file extension | Apple | ITunes Authorization Data Format |
| SIDD file extension | Apple | Apple ITunes Authorization Data Format |
| SIDN file extension | Apple, Inc. | Apple ITunes Authorization Data |
| SIL file extension | Gurock Software | SmartInspect Log |
| SILO file extension | Department of Energy (DOE) Advanced Simulation and Computing Initiative (ASCI) | VisIt Hydrodynamical Numerical Simulation Data |
| SIN file extension | Google Inc. | Xperia System Loader |
| SINF file extension | Apple, Inc. | Apple IOS Digital Rights Management |
| SIS file extension | Symbian | Symbian Installation Format |
| SISDM file extension | Nokia | Nokia Ovi Store Protected Program Format |
| SISX file extension | Symbian | Symbian OS Program Installation Executable Format |
| SISXDM file extension | Nokia | Nokia Ovi Store Protected Program Format |
| SITL file extension | Smith Micro Software, Inc. | StuffIt Library |
| SITO file extension | Smith Micro Software, Inc. | StuffIt Translator |
| SK file extension | Apple | Safari Saved Browsing History Format |
| SKA file extension | N/A | Happy99 Virus |
| SKD file extension | Intermorphic | SSEYO Koan Design |
| SKG file extension | Skrooge Development team | Skrooge Data |
| SKINDEX file extension | N/A | Apple Mail Index Format |
| SKR file extension | N/A | PGP Pretty Good Privacy Private Keyring Format |
| SKT file extension | Intermorphic | SSEYO Koan |
| SKYPECHATSTYLE file extension | Skype | Skype Chat Style Format |
| SL00 file extension | Stripf Software | HLSW Game Server Tool |
| SL01 file extension | Stripf Software | HLSW Game Server Tool |
| SL02 file extension | Stripf Software | HLSW Game Server Tool |
| SL03 file extension | Stripf Software | HLSW Game Server Tool |
| SL05 file extension | Stripf Software | HLSW Game Server Tool |
| SL06 file extension | Stripf Software | HLSW Game Server Tool |
| SL07 file extension | Stripf Software | HLSW Game Server Tool |
| SL08 file extension | Stripf Software | HLSW Game Server Tool |
| SL09 file extension | Stripf Software | HLSW Game Server Tool |
| SL10 file extension | Stripf Software | HLSW Game Server Tool |
| SL11 file extension | Stripf Software | HLSW Game Server Tool |
| SL12 file extension | Stripf Software | HLSW Game Server Tool |
| SL13 file extension | Stripf Software | HLSW Game Server Tool |
| SL14 file extension | Stripf Software | HLSW Game Server Tool |
| SL15 file extension | Stripf Software | HLSW Game Server Tool |
| SL16 file extension | Stripf Software | HLSW Game Server Tool |
| SL17 file extension | Stripf Software | HLSW Game Server Tool |
| SL18 file extension | Stripf Software | HLSW Game Server Tool |
| SL19 file extension | Stripf Software | HLSW Game Server Tool |
| SL20 file extension | Stripf Software | HLSW Game Server Tool |
| SL21 file extension | Stripf Software | HLSW Game Server Tool |
| SL23 file extension | Stripf Software | HLSW Game Server Tool |
| SL24 file extension | Stripf Software | HLSW Game Server Tool |
| SL25 file extension | Stripf Software | HLSW Game Server Tool |
| SL26 file extension | Stripf Software | HLSW Game Server Tool |
| SL27 file extension | Stripf Software | HLSW Game Server Tool |
| SL28 file extension | Stripf Software | HLSW Game Server Tool |
| SL29 file extension | Stripf Software | HLSW Game Server Tool |
| SL30 file extension | Stripf Software | HLSW Game Server Tool |
| SLB file extension | Autodesk | Autodesk AutoCAD Slide Library |
| SLDSTD file extension | SolidWorks Corporation | SolidWorks Drafting Standard |
| SLF file extension | Symantec | Symantec License Format |
| SLG file extension | Dionex Corporation | Chromeleon Audit Trail |
| SLI file extension | Exelis Visual Information Solutions | ENVI Spectral Library |
| SLIB file extension | Synopsys, Inc. | Synopsys Interface Timing Specification Model |
| SLIP file extension | Embarcadero Technologies, Inc. | CodeGear Licence |
| SLNK file extension | SAP AG | SAP Business All-in-One Extension |
| SLR file extension | Grassland, Soil & Water Research Laboratory | ArcSWAT Solar Radiation Input |
| SLUPKG-MS file extension | Microsoft | XrML Digital License Package |
| SLV file extension | Infrae | Silva Import And Export |
| SLW file extension | Settler Computer Technologies, Inc. | Settler LITE Data |
| SM2 file extension | RHK Technology, Inc. | RHK Technology Proprietary |
| SM3 file extension | DATACAD LLC. | DataCAD Symbol |
| SM4 file extension | RHK Technology, Inc. | RHK Technology Proprietary |
| SMB file extension | Autodesk, Inc. | Autodesk Symbol Library |
| SMCL file extension | StataCorp LP | Stata Log |
| SMDL file extension | Microsoft Corporation | SQL Server Updated Model |
| SMOL file extension | Wavefunction | Spartan Molecule Data |
| SMPAK file extension | SuperMemo World sp. z o.o. | SuperMemo UX |
| SMPO file extension | N/A | Scalado SpeedView Meta Object |
| SMPS file extension | LINDO SYSTEMS | LINDO API |
| SMRD file extension | Adobe Systems | Adobe InDesign Format |
| SMST file extension | Adobe Systems Incorporated | Adobe Soundbooth Music Score Toolkit |
| SMTMP file extension | N/A | Trojan:Win32/FakeSysdef Folder |
| SMWT file extension | Adobe Systems | Adobe InDesign Filter Format |
| SMX file extension | IBM | Rational XDE |
| SN file extension | N/A | PG4UW Serialization |
| SNAPDOC file extension | Ashampoo GmbH & Co. KG | Ashampoo Snap |
| SNAPFIREPROJECT file extension | Corel Corporation | Corel Snapfire Project |
| SNM file extension | N/A | Netscape Communicator E-Mail Or News Messages Index Format |
| SNR file extension | IDEAlliance | Mail.Dat Seed Name |
| SNT file extension | Microsoft | Microsoft Windows Sticky Notes Data Format |
| SNU file extension | AVG Technologies (Grisoft) | AVG Anti-Virus |
| SO-ABI file extension | AbiSource | AbiWord Plug-in Format |
| SOA file extension | The Sage Group plc | Sage MAS 90 Accounting Software Data |
| SOC file extension | OpenOffice.org Project Team | Colour Palettes And Various Style Elements |
| SOF file extension | Altera | Quartus II SRAM Object |
| SOM file extension | Corel Corporation | Corel Paradox Sort Information |
| SOR file extension | Adobe Systems Incorporated | Adobe Flash Media Server System Object |
| SOS file extension | DRS Data Services Limited | DRS SOSKit Barcode Decode Instructions |
| SOV file extension | Dimensional Control Systems | 3DCS Advanced Analyzer/Optimizer SOVA Model |
| SP1 file extension | Microsoft Corporation | Microsoft Windows XP With Service Pack 1 Installation |
| SP7 file extension | SAS Institute Inc. | SAS Permanent Utility |
| SPAR file extension | Wavefunction | Spartan Chemical Modeller Output |
| SPARC file extension | Skype | Skype Extra Plug-in Format |
| SPDATA file extension | Microsoft Corporation | Microsoft Visual Studio |
| SPDESIGNASAX file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNASMX file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNBAR file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNBOT file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNCSS file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNDOCLIB file extension | Microsoft Corporation | SharePoint Designer Design Library |
| SPDESIGNFILE file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNHOMEOP file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNHOMEPG file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNHTML file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNHTT file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNLIST file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNLISTDATA file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNMASTER file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNNAV file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNNOPUB file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNPICLIB file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNRESX file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNSURVEY file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNTHEME file extension | Microsoft Corporation | SharePoint Designer Theme |
| SPDESIGNTXT file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNUNKNOWN file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNWEB file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNWFDOCLIB file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNXML file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNXOML file extension | Microsoft Corporation | SharePoint Designer |
| SPDESIGNXSLT file extension | Microsoft Corporation | SharePoint Designer |
| SPIN file extension | Apple, Inc. | Apple Mac OS X Console Spin Report |
| SPINPUT file extension | Wavefunction | Spartan Job |
| SPKZ file extension | Scribe Software Corporation | Scribe Template |
| SPL7 file extension | ABACOM | SPlan Data |
| SPLSP file extension | SmartPLS | SmartPLS Project |
| SPLX file extension | HelloApps | Code Package |
| SPM file extension | Corel Corporation | Corel WordPerfect |
| SPMO file extension | Scalado AB | SpeedView Meta Object |
| SPN file extension | Corel Corporation | Corel WordPerfect Distribution |
| SPRJ file extension | Microsoft Corporation | Microsoft Application Virtualization Sequencer Project |
| SPRX file extension | N/A | Sony Playstation 3 SPRX Firmware |
| SPSS file extension | IBM | SPSS |
| SQLITE-SHM file extension | SQLite Development Team | SQLite Shared Memory |
| SQLITE-WAL file extension | SQLite Development Team | SQLite Quasi-persistent |
| SQLITE3-JOURNAL file extension | SQLite Development Team | SQLite Temporary |
| SQN file extension | SAS Institute Inc. | SAS Sequential Access |
| SQU file extension | National Instruments Corporation | LabWindows/CVI Test Executive Toolkit Sequence |
| SQY file extension | University of Oxford | Xaira Query |
| SR0 file extension | Sony | Sony SecuROM Analysis Format |
| SRA file extension | Sybase Inc. | Powerbuilder Application |
| SRD file extension | Sybase Inc. | PowerBuilder Data Window |
| SRE file extension | Microsoft Corporation | Windows CE 5.0 |
| SRG file extension | Ketron | Ketron Single Registration Format |
| SRJ file extension | Sybase Inc. | PowerBuilder Project |
| SRL file extension | SmartWare Corporation | SmartWare Resource Library |
| SRQ file extension | Microsoft Corporation | Microsoft Windows Server Unprocessed Request |
| SS4 file extension | StudyLamp Software LLC | SwordSearcher Program Data Format |
| SSB file extension | StudyLamp Software LLC | SwordSearcher Bible Data Module |
| SSC file extension | The Stellarium Team | Stellarium Script Format |
| SSD file extension | Stardock | Stardock WindowBlinds Skin File List |
| SSD01 file extension | The Open Group | Unix SAS Data Sets |
| SSDL file extension | SmartSound | SmartSound Update Library |
| SSE file extension | Avarin Systems Inc. | StrataSearch |
| SSG file extension | Self Evident Enterprises, LLC. | Single-Step Goal Template |
| SSH file extension | F-Secure | Data Fellows Secure Shell Document |
| SSISDEPLOYMENTMANIFEST file extension | Microsoft Corporation | Microsoft Visual Studio Deployment |
| SSLF file extension | N/A | HLSW Game Server Tool Format |
| SSN file extension | DNsoft | Shutdown Scheduler Shared Notes Data |
| SSS~ file extension | Stardock Corporation | WindowBlinds Temporary |
| SST file extension | Microsoft | Serialized Certificate Store Format |
| SSU file extension | Microsoft Corporation | Systems Management Server Hierarchy Manager Site Update |
| SSW file extension | SETool2 | Sony Ericsson Firmware Update Format |
| SSX file extension | Program Factory | ScreenShare Data |
| SSY file extension | N/A | W32/Sober-AD |
| ST0 file extension | National Instruments Corporation | SPICE Status |
| ST1 file extension | National Instruments Corporation | SPICE Status |
| ST2 file extension | National Instruments Corporation | SPICE Status |
| ST3 file extension | National Instruments Corporation | SPICE Status |
| ST4 file extension | National Instruments Corporation | SPICE Status |
| ST5 file extension | National Instruments Corporation | SPICE Status |
| ST6 file extension | National Instruments Corporation | SPICE Status |
| ST7 file extension | National Instruments Corporation | SPICE Status |
| ST8 file extension | National Instruments Corporation | SPICE Status |
| ST9 file extension | National Instruments Corporation | SPICE Status |
| STAT file extension | Richard Hughey - Kevin Karplus - Anders Krogh | Statistics |
| STATE file extension | N/A | Windows Photo Gallery User |
| STATUS file extension | Universität Bremen | UDraw(Graph) |
| STD file extension | N/A | SureThing CD Labeler Document Format |
| STH file extension | IBM | Lotus Domino Stash Format |
| STMB file extension | N/A | Synclavier Timbre Format |
| STORYMILL file extension | Mariner Software | StoryMill Project Format |
| STOT file extension | Apple, Inc. | Mac OS Help Index |
| STRK file extension | N/A | Geologger Track Format |
| STUB file extension | Apple, Inc. | Mac OS X Stub Library |
| STVPROJ file extension | Microsoft Corporation | Microsoft Visual Studio |
| SU3 file extension | Rick Tewell | Su3De |
| SUA file extension | Naviter d.o.o. | SeeYou Airspace |
| SUBLIME-PACKAGE file extension | Sublime HQ Pty Ltd | Sublime Text Compressed Extension Package |
| SUC file extension | AceBIT GmbH | Softrans Hello Engines! 2.1 |
| SUCATALOG file extension | Apple, Inc. | Apple Mac OS X Software Update SUCatalog |
| SUGAR file extension | MacRabbit | Espresso Plug-in Format |
| SUM file extension | Garmin | Summary Format |
| SUN4 file extension | Sun Microsystems, Inc. | SunOS Solaris 4 |
| SUT file extension | DENT Instruments | ELITEpro Data Logger |
| SV4CRC file extension | GnuWin32 Team | GnuWin32 CPIO Checksum Data |
| SVCLOG file extension | Microsoft Corporation | Microsoft Visual Studio Diagnostics |
| SVCMAP file extension | Microsoft Corporation | Windows Communication Foundation WCF Reference |
| SVM file extension | N/A | StarView Metafile |
| SVN-WORK file extension | CollabNet | CollabNet Subversion Cache Format |
| SVP file extension | SwiftView, Inc. | SwiftView Command |
| SW0 file extension | National Instruments Corporation | SPICE Sweep Operations Output |
| SW1 file extension | National Instruments Corporation | SPICE Sweep Operations Output |
| SW3 file extension | National Instruments Corporation | SPICE Sweep Operations Output |
| SW4 file extension | National Instruments Corporation | SPICE Sweep Operations Output |
| SW5 file extension | National Instruments Corporation | SPICE Sweep Operations Output |
| SW6 file extension | National Instruments Corporation | SPICE Sweep Operations Output |
| SW7 file extension | National Instruments Corporation | SPICE Sweep Operations Output |
| SW8 file extension | National Instruments Corporation | SPICE Sweep Operations Output |
| SW9 file extension | National Instruments Corporation | SPICE Sweep Operations Output |
| SWB file extension | Adobe Systems Incorporated | Adobe Photoshop |
| SWEB file extension | Borne Programming and Spider Applications | SpiderWEB Document |
| SWISH-E file extension | The Swish-e Project | SWISH-E |
| SWITCHBOARD file extension | Adobe Systems Incorporated | Adobe SwitchBoard Server |
| SWJ file extension | Dassault Systemes | SolidWorks Journal Format |
| SWLT file extension | SBSH Software LTD | SafeWallet |
| SWN file extension | Bram Moolenaar | Vim Temporary |
| SWO file extension | Bram Moolenaar | Vim Temporary |
| SWP file extension | Bill Joy | Swap Format |
| SWQ file extension | Grassland, Soil & Water Research Laboratory | SWAT Stream Water Quality Input |
| SWS file extension | TIBCO Software Inc | S-PLUS Workpsace |
| SWTAG file extension | Adobe Systems Incorporated | Adobe Creative Suite Software Tag |
| SXM file extension | N/A | OpenOffice.org 1.0 Math Format |
| SY0 file extension | MicroVision Development, Inc. | WordExpress |
| SY1 file extension | Daichi Laboratory | Synth 1 Patch |
| SY7 file extension | Trafficware Ltd. | Synchro Studio 7 Output |
| SYC file extension | N/A | Sniffer Capture |
| SYD file extension | Systat Software Inc. | SYSTAT Data |
| SYG file extension | Systat Software Inc. | SYSTAT Graph |
| SYNC file extension | Apple, Inc. | Apple ColorSync |
| SYNDARTICLE file extension | N/A | Paralllels Desktop |
| SYNK5LICENCE file extension | Decimus Software, Inc. | Synk 5 Licence |
| SYNKLICENCE file extension | Decimus Software, Inc. | Synk Licence |
| SYS-OLD file extension | Red Hat, Inc. | Cygwin Terminfo |
| SYSK file extension | Red Hat, Inc. | Cygwin Terminfo |
| SYV file extension | Write Brothers, Inc. | Outline 4D |
| SY~ file extension | Corel Corporation | CorelDRAW |
| SZ3 file extension | Psi | ScreamTracker V3 |
| SZF file extension | Deutsche Automobil Treuhand GmbH | SilverDAT II Data Exchange Format |
| SZP file extension | PKWARE, Inc. | SecureZIP Policy |
| T$2A file extension | Netopia, Inc., a Motorola Company | Timbuktu Pro |
| T$AB file extension | Netopia, Inc., a Motorola Company | Timbuktu Pro Address Book |
| T$M file extension | Grisoft | AVG Internet Security Temporary Format |
| T00 file extension | HRB Digital LLC. | TaxCut Federal Data |
| T13 file extension | N/A | H&R Block Tax Software Tax Return |
| T16 file extension | MartinDiehl | DAMASK |
| T2S file extension | EPA | Tier2 |
| T32 file extension | PowerQuest | Drive Image 5 |
| T3V file extension | Michael J. Roberts | TADS 3 Saved Position |
| T3X file extension | N/A | TYPO3 Compressed Extension |
| T44 file extension | dataBased Intelligence, Inc. | DBASE IV Temporary |
| T49 file extension | N/A | HP48/HP49 Specific |
| T80 file extension | Chempute Software | TANK - API 650/653 Output Document |
| TA1 file extension | 2nd Story Software | TaxACT 2001 Tax Form |
| TA9 file extension | 2nd Story Software | TaxACT Tax Document |
| TAG file extension | N/A | DataFlex Query Tag Name Format |
| TAL file extension | Rainer Goebel | BrainVoyager QX Talairach Coordinate |
| TAN file extension | Amazon.com, Inc. | Amazon Kindle |
| TAX file extension | N/A | TurboTax Tax Return Format |
| TAX13 file extension | Intuit Inc. | TurboTax Tax Return |
| TAX2013 file extension | Intuit Inc. | TurboTax Tax Return |
| TB2 file extension | TAS Software | TASBooks Accounting Backup |
| TB3 file extension | Intel Corporation | Intel VTune Performance Monitor Sampling Data |
| TB5 file extension | Intel Corporation | Intel VTune Performance Monitor Sampling Data |
| TBA file extension | Inmagic, Inc. | DB/Text Database Primary Textbase Definition |
| TBD file extension | DATAIR Employee Benefit Systems, Inc. | Document System Document Source Code |
| TBF file extension | Trellian | Trellian Button Factory |
| TBI file extension | N/A | The Bat! Hive Index |
| TBP file extension | Autodesk | Autodesk Topobase Format |
| TBS file extension | TuneUp Corporation | TuneUp Style Boot Screen Format |
| TBT file extension | Netopia, Inc., a Motorola Company | Timbuktu Pro Remote Control Software |
| TBV file extension | Brain Innovation B.V. | Turbo-BrainVoyager Data |
| TCB file extension | FAL Labs | Tokyo Cabinet TBZIP |
| TCF file extension | Turbosoft Pty Ltd. | TTWin 3 Certificate Licensing |
| TCLOG file extension | SmartBear Software | TestComplete Log |
| TCR file extension | TouchMagix Media | TouchMagix Creative Suite Published Format |
| TCZ file extension | Linux | Tiny Core Linux Script Format |
| TCZL file extension | N/A | Tiny Core Linux Xlib |
| TD file extension | Thunder Network Technologies | Thunder Incomplete Download Format |
| TDAT file extension | Freescale Semiconductor, Inc. | Codewarrior Mac |
| TDC file extension | balesio AG | ALLCapture Project |
| TDK file extension | Borland Software Corporation | Borland Turbo Debugger Keystroke Recording |
| TDL file extension | N/A | MathType Translator Definition Language |
| TDLOG file extension | Microsoft Corporation | Microsoft Visual Studio |
| TDMS file extension | National Instruments Corporation | LabVIEW TDMS |
| TDMS_INDEX file extension | National Instruments Corporation | LabVIEW |
| TDR file extension | Medlin Accounting | Medlin Payroll Software Tax Deposit Record |
| TDV file extension | National Instruments Corporation | DIAdem VIEW Module Setup Information |
| TDY file extension | TODAY Systems, Inc. | TODAY BuildProfessional Application |
| TEC file extension | SIL International | Tecplot ASCII Data Format |
| TEMP file extension | N/A | Temporary Format |
| TEMPORARYITEMS file extension | Apple, Inc. | Mac OS X Temporary |
| TEN file extension | Steema Software | TeeChart For .NET Chart Control Template |
| TEP file extension | SourceForge.net | TopiaryExplorer Project |
| TEQ file extension | SBC | Saia S-Web-Editor PCD |
| TER file extension | Planetside Software | TerraGen Landscape |
| TERM file extension | Apple, Inc. | Apple Mac OS X Terminal |
| TERMS file extension | Red Hat, Inc. | Cygwin Demos |
| TES file extension | N/A | TECO Macro |
| TEXTEXPANDER file extension | SmileOnMyMac, LLC | TextExpander |
| TEXTS file extension | M.Carson | Ribbons Texts |
| TEXTUTILS file extension | The GNOME Project | Gnome Desktop |
| TFH file extension | Borland Software Corporation | Turbo Profiler Help |
| TFIL file extension | Blizzard Entertainment | Blizzard Software Update Format |
| TFL file extension | Tific | Tific Client |
| TFP file extension | Schneider Electric S.A. | ProWORX Nxt Full Page Data |
| TFS file extension | Borland Software Corporation | Turbo Profiler Statistical Information |
| TFT file extension | FormatBlue Software | Text Formatter Plus Text Information |
| TFX file extension | Dowling Associates, Inc. | Traffix Traffic Analysis Software |
| TGC file extension | Planetside Software | Terragen Node Clip |
| TGL file extension | SkyMap Software | SkyMap Pro Target List |
| TGMD file extension | yougrids | ThumbGen Movie Metadata |
| TGMG file extension | Axel Shootingstar | TabGroups Manager For Firefox Exported Group |
| TGP file extension | Jo Meder | TGPGuiLib Terragen Plugin |
| TGS file extension | N/A | GSTree Phylogenetic Tree Information |
| THF file extension | Symantec Corporation | PcAnywhere Thin Host |
| THM file extension | Sony Ericsson | Sony Ericsson Mobile Phone Theme Format |
| THN file extension | Alchemy Mindworks | GIF Construction Set Construction Data |
| THR file extension | Parametric Technology Corporation | Pro/ENGINEER |
| THS file extension | Corel Corporation | Corel WordPerfect Thesaurus Dictionary |
| THUMBDATA file extension | Google Inc. | Google Android Thumbnail Database |
| THUMBDATA3 file extension | Google Inc. | Google Android Thumbnail Database |
| THUMBDATA3--1763508120 file extension | Google Inc. | Android Thumbnail Index |
| THUMBDATA3--1967290299 file extension | Google Inc. | Android Thumbnail Index |
| THUMBDATA3--NUMBER file extension | Google Inc. | Android MediaProvider Thumbnail Database |
| THUMBDATA4 file extension | Google Inc. | Google Android Thumbnail Database |
| THUMBDATA4--1763508120 file extension | Google Inc. | Android Thumbnail Index |
| THUMBDATA4--1967290299 file extension | Google Inc. | Android Thumbnail Index |
| THUMBDATA5 file extension | Google Inc. | Google Android Thumbnail Database |
| THUMBDATA5--1763508120_0 file extension | Google Inc. | Android Thumbnail Index |
| THUMBDATA5--1967290299_0 file extension | Google Inc. | Android Thumbnail Index |
| TIC file extension | Esri | ArcInfo Coordinates |
| TID file extension | IBM | IBM Voice Type Languages Tasks |
| TII file extension | Apache Software Foundation | Apache Lucene Term Info Index |
| TINY file extension | The GNOME Project | Gnome Desktop |
| TIP file extension | TuneUp Corporation | TuneUp Utilities Icon Package Format |
| TIW file extension | Bentley Systems, Incorporated | Bentley InRoads |
| TJF file extension | IBM | IBM Rational ClearCase Transaction |
| TKB file extension | Elk River Systems | TicketBench Data |
| TKL file extension | N/A | Takeoff Live PDF Working Data |
| TKM file extension | Andrew Wilson | TkMOO-light |
| TKN file extension | Shoptalk Systems | Liberty BASIC Application Distribution |
| TKO file extension | N/A | Win32/Oficla Malware Format |
| TKW file extension | Universal Technical Systems, Inc. | TK Solver |
| TLA file extension | TuneUp Corporation | TuneUp Logo Animations |
| TLB file extension | Microsoft | OLE Type Library |
| TLIC file extension | N/A | Trust Lincense |
| TLM file extension | Timeline Maker Software | Timeline Maker Timeline |
| TLQ file extension | Nova Development Corporation | Art Explosion T-Shirt Factory Deluxe |
| TLR file extension | Tableau Software | Tableau Offline License Registration |
| TLS file extension | TuneUp Corporation | TuneUp Utilities Logon Screen Format |
| TLT file extension | Bennet-Tec Information Systems, Inc. | TList Data |
| TLV file extension | Magestic Systems, Inc. | TruLASER View Geometry Data |
| TM1 file extension | David Berman Developments Inc. | TimeWise |
| TMB file extension | Netopia | Timbuktu Pro Connection Document Format |
| TMBUNDLE file extension | MacroMates | TextMate Bundle Format |
| TMK file extension | Embarcadero Technologies, Inc. | Turbo Pascal Tour |
| TML file extension | Association of Shareware Professionals, Inc. | PADGen |
| TMM file extension | LexisNexis | TimeMap Metadata |
| TMPL file extension | Xfire | Xfire User Interface Template Format |
| TMQ file extension | Bob Beveridge | TestMaster |
| TNA file extension | Adtollo | Topocad Net Adjustment |
| TNEF file extension | N/A | Transport Neutral Encapsulation Format |
| TNSP file extension | Texas Instruments | Texas Instruments TI-Nspire PublishView Document Format |
| TNT file extension | Turntool ApS | TurnTool 3D Model |
| TNX file extension | PageTech | PCL Toolkit Text Extraction |
| TOB file extension | ZEMAX Development Corporation | ZEMAX Object Data |
| TOC file extension | QUALCOMM | Table Of Contents Format |
| TOCF file extension | QUALCOMM Incorporated | Eudora For Mac TOC |
| TOE file extension | Derivative | Touch Environment Project |
| TOF file extension | NewSoft Technology Corporation | Mr. Photo Temporary Thumbnail |
| TOK file extension | Micro Focus International plc | Borland C++ 4.x External Tokens |
| TOM file extension | Aptora Software | Total Office Manager Accounting Data |
| TON file extension | HeiRue-Soft | FMS32 Protocol |
| TOOL file extension | Apple, Inc. | Apple Mac OS X Terminal |
| TOOLS file extension | Delorie Software | DJGPP Tools |
| TOPX file extension | Rick Meyers | E-sword Topic Note |
| TORCHDOWNLOAD file extension | Torch Media | Torch Web Browser Partial Download |
| TORRENT file extension | BitTorrent | BitTorrent Information Format |
| TOX file extension | Derivative | Touch Component |
| TP7 file extension | Spectral Sciences Inc. | MODTRAN |
| TPA file extension | Corel Corporation | CorelDRAW Custom Graphic |
| TPE file extension | SoftVelocity | Clarion Example |
| TPG file extension | Performance Systems Development | TREAT Project |
| TPI file extension | Thomson | EDIUS Plugin Format |
| TPK file extension | The Linux Foundation | Tizen Application Package |
| TPL file extension | N/A | Generally A Template Format |
| TPM file extension | Microsoft | Microsoft Trusted Platform Module Password Format |
| TPP file extension | N/A | Borland Pascal Protected Mode Units |
| TPS file extension | Clarion | Clarion For Windows Top Speed Data Format |
| TPT file extension | Cerious Software, Inc. | ThumbsPlus Thumbnail Template |
| TPW file extension | Embarcadero Technologies, Inc. | Borland Turbo Pascal Unit |
| TQF file extension | IBM | Rational Test RealTime |
| TR0 file extension | National Instruments Corporation | SPICE Transient Analysis Output |
| TR1 file extension | IBM | IBM Voice Type Languages Addword |
| TR2 file extension | National Instruments Corporation | SPICE Transient Analysis Output |
| TR4 file extension | National Instruments Corporation | SPICE Transient Analysis Output |
| TR5 file extension | National Instruments Corporation | SPICE Transient Analysis Output |
| TR6 file extension | National Instruments Corporation | SPICE Transient Analysis Output |
| TR7 file extension | National Instruments Corporation | SPICE Transient Analysis Output |
| TR8 file extension | National Instruments Corporation | SPICE Transient Analysis Output |
| TR9 file extension | National Instruments Corporation | SPICE Transient Analysis Output |
| TRACE file extension | VMware | VMware ThinApp Trace Log Format |
| TRASHES file extension | Google Inc. | Google Android Mobile Phone |
| TRASHINFO file extension | N/A | Trash Storage Metadata |
| TRB file extension | Hash, Inc. | Animation Master Turbulence Extension |
| TRC file extension | Oracle | Oracle SQL*Net Trace Debug Format |
| TRCE file extension | Corel Corporation | Corel Trace |
| TRE file extension | TreeAge Software, Inc. | TreeAge Decision Tree |
| TREE file extension | McGoo Software | ES-Builder Tree |
| TRF file extension | N/A | LFToolkit Transformation Rules |
| TRG file extension | Symantec Corporation | Symantec LiveUpdate |
| TRL file extension | TrackLogs | TrackLogs Digital Mapping Track Log |
| TRO file extension | IBM | IBM Voice Type Languages Vocable |
| TRR file extension | Gromacs | GROMACS Full-precision Trajectory |
| TRV file extension | Traverse PC, Inc. | Traverse PC Desktop Survey Data |
| TRZ file extension | Symantec Corporation | Norton Antivirus Rapidrelease Definition Update |
| TS2 file extension | Syntap Software | Time Stamp Project Information |
| TSD file extension | Software AG | Tamino Schema Editor |
| TSG file extension | CSIRO Earth Science and Resource Engineering (CESRE) | TSG Data |
| TSN file extension | National Center for Biotechnology Information | RatLab Toolkit |
| TSR file extension | N/A | TSR Launcher |
| TSS file extension | Galactix Software | Team Sports Scheduling System Project Format |
| TSTREAM file extension | p2p-next consortium | SwarmPlayer Video Stream Control Format |
| TT13 file extension | Intuit Inc. | TurboTax 2013 Tax Return |
| TT4 file extension | Sensitech | TempTale |
| TTBS file extension | Microsoft Corporation | Microsoft PowerPoint For Mac Toolbar |
| TTD file extension | Gemini Data Loggers UK | Tinytag Data Log |
| TTI file extension | N/A | Beast Trojan |
| TTN file extension | Bentley Systems, Incorporated | Bentley InRoads Topologically Triangulated Network |
| TTT file extension | N/A | TextTransformer Exported Test |
| TTX file extension | SDL | TRADOS TagEditor TRADOStag XML Format |
| TTY file extension | Adobe Systems Incorporated | Macromedia Dreamweaver |
| TUB file extension | N/A | Corel PaintShop Photo Pro Picture Tube Format |
| TUW file extension | Microsoft Corporation | Microsoft Office |
| TV1 file extension | Corel Corporation | Corel WordPerfect Overflow |
| TV2 file extension | Corel Corporation | Corel WordPerfect Overflow |
| TV3 file extension | Corel Corporation | Corel WordPerfect Overflow |
| TV4 file extension | Corel Corporation | Corel WordPerfect Overflow |
| TV5 file extension | Corel Corporation | Corel WordPerfect Overflow |
| TV6 file extension | Corel Corporation | Corel WordPerfect Overflow |
| TV7 file extension | Corel Corporation | Corel WordPerfect Overflow |
| TV8 file extension | Corel Corporation | Corel WordPerfect Overflow |
| TV9 file extension | Corel Corporation | Corel WordPerfect Overflow |
| TVC file extension | Nullsoft, Inc. | Winamp TV Channel Data |
| TVD file extension | Apache Software Foundation | Apache Lucene Term Vector Documents |
| TVEX file extension | Apple, Inc. | Apple QuickTime MoviePlayer Extension |
| TVF file extension | Apache Software Foundation | Apache Lucene Term Vector Fields |
| TVL file extension | N/A | TurboTax Format |
| TVM file extension | equinux USA, Inc. | The Tube |
| TVP file extension | TVPaint | TVP Animation Animation Data |
| TVR file extension | PremiumSoft CyberTech Ltd. | Navicat For MySQL |
| TVT file extension | IBM | IBM Lenovo ThinkVantage Rescue And Recovery |
| TVX file extension | Apache Software Foundation | Apache Lucene Term Vector Index |
| TWAIN file extension | Adobe Systems Incorporated | Adobe Acrobat TWAIN 1.8 Specification |
| TWD file extension | SimTech | MindMapper Brainstorm And Visual Map |
| TWE file extension | ThinkWave, Inc. | ThinkWave Educator Data |
| TWG file extension | SINTEF | CARE-S InfoWorks Trade Waste |
| TWI file extension | N/A | SDDS Toolkit |
| TWK file extension | Kolay and CODeRUS | TweakS |
| TWS file extension | Tripwire, Inc, | Tripwire Schedule |
| TX file extension | Impressum | Photoline 5 Help |
| TX0 file extension | RMR CO. | Portable Radiation Package Data |
| TXM file extension | Softsyss | Tagsoft Data |
| TXT12 file extension | N/A | IRI Scouting Database XML |
| TXTDT file extension | N/A | TitleWriter DVD Text Data |
| TXU file extension | IBE Software GmbH | CncCUT Program Text |
| TXV file extension | SoftOlogy IdeaWorks, LLC | RapidReader TextVision |
| TYM file extension | Adobe Systems Incorporated | Adobe PageMaker Time Stamp |
| TZD file extension | AOL Inc. | Netscape Communicator |
| U08 file extension | Dr Tax Software | UFile Data |
| U32 file extension | Adobe Systems Incorporated | Authorware Cover |
| U96 file extension | ConeXware, Inc. | EasyZip Temporary |
| UAL file extension | Entrust | Entrust Unattended Login Credentials |
| UBM file extension | N/A | IPhoto Mtwain Install |
| UCLS file extension | ObjectAid LLC | ObjectAid UML Explorer Class Diagram |
| UCR file extension | Cadence Design Systems, Inc. | MicroSim PCBoard Unrouted Nets Report |
| UCV file extension | Anthony R. Daly | Universal Converter Conversion |
| UCX file extension | IBM | Rational XDE |
| UDA file extension | ZEMAX Development Corporation | ZEMAX Model Data |
| UDG file extension | Universität Bremen | UDraw(Graph) |
| UDID file extension | Google Inc. | Google Android Unique Device IDentifier |
| UDX file extension | Power Integrations | PI Expert Design Software |
| UFA file extension | N/A | GIF Animator Animation Object Information |
| UFC file extension | Atkins-ITS Transport Software | SATURN Suite |
| UFF file extension | DataWave Technologies | DataWave SciWorks Physiological Data |
| UFI file extension | SonotaCo | UFOCaptureV2 |
| UIC file extension | N/A | COCO Unit ICon |
| UID file extension | IBM | IBM Voice Type Users |
| UIL file extension | IBM | IBM AIX User Interface Language |
| UIR file extension | National Instruments Corporation | LabWindows User Interface Resource |
| UIZ file extension | Safer-Networking Ltd. | Spybot Search & Destroy Updater |
| UKS file extension | Microsoft Corporation | Microsoft Works |
| UKY file extension | UltraMixer Digital Audio Solutions | UltraMixer Licence Key |
| ULB file extension | N/A | COBOL Unisys Library |
| ULD file extension | DIAL GMBH | Unified Luminaire Datafile |
| ULS file extension | Microsoft | NetMeeting User Location Service Format |
| UMLX file extension | Visual Object Modelers, Inc. | Visual UML XML Model |
| UMM file extension | N/A | Unified Molecular Modeling |
| UMR file extension | Genuitec, LLC | MyEclipse UML Model Repository |
| UNA file extension | Capita Business Services Ltd. | SIMS Unauthorized Data |
| UNF file extension | Novell, Inc. | Btreive Unformatted |
| UNIX file extension | The Open Group | Unix |
| UNK file extension | N/A | Unknown Format |
| UNKNOWN file extension | N/A | Unknown File Extension |
| UNL file extension | Garmin | Garmin MapSource Unlock Format |
| UNQ file extension | The Sage Group plc | ACT! 3.0 Email Message Attachment |
| UNV file extension | SAP AG | BusinessObjects Universe |
| UOL file extension | Ulead Systems | PhotoImpact Clipart Image |
| UPC file extension | J-T-L Development Inc. | Ultimate Paint Component |
| UPG file extension | N/A | Firmware Upgrade Format |
| UPI file extension | N/A | Ulead PhotoImpact Plugin |
| UPJ file extension | N/A | Ulead Project |
| UPM file extension | UC-Logic Technology Corp. | PenMail |
| UPO file extension | dataBased Intelligence, Inc. | DBASE Compiled Update Data |
| UPS file extension | Microsoft Corporation | Microsoft Works |
| UPZ file extension | Star Finanz GmbH | StarMoney Agent Download |
| URD-JOURNAL file extension | Kinook Software, Inc. | Ultra Recall Journal Update |
| URF file extension | N/A | ProWORX Nxt User Configurable Register Editor |
| URP file extension | Universal Software C. T. | Universal Report |
| URR file extension | Compuware | Uniface Signatures Format |
| USB file extension | SiSoftware | SiSoftware Sandra |
| USECASEDIAGRAM file extension | Microsoft Corporation | Microsoft Visual Studio Use Case Diagram |
| USH file extension | Creston Electronics, Inc. | Creston SIMPL Windows |
| USL file extension | Schneider Electric S.A. | ProWORX Nxt USL Loadable |
| USP file extension | Adobe Systems Incorporated | PageMaker Printer Font |
| UTL file extension | Intuit Inc. | QuickBooks Data |
| UTPART file extension | BitTorrent, Inc. | µTorrent Unfinished Download |
| UV2 file extension | ARM Holdings plc | µVision Project |
| UVR file extension | N/A | UVR Mesh |
| UXDC file extension | Microsoft Corporation | Microsoft Excel Data Retrieval Service Connection |
| UZY file extension | N/A | Backdoor.Sokacaps |
| V03 file extension | Axialis Software | Axialis Thumbnail Cache |
| V11O file extension | N/A | ACDSee Offline Media |
| V11PF file extension | N/A | ACDSee Private Folder |
| V2 file extension | Microsoft Corporation | Microsoft Live Messenger Data |
| VAF file extension | Microsoft Corporation | Microsoft Visual Studio Common Tools Analyzer Server Project Item |
| VAM file extension | Microsoft Corporation | MS Visual Studio Common Tools Vanalyzer Project Item |
| VBA file extension | Microsoft Corporation | Visual Basic VBA Module |
| VBDPROJ file extension | N/A | Visual Basic .NET Device Project |
| VBL file extension | Microsoft Corporation | Visual Basic User Control Licensing |
| VBN file extension | Symantec Corporation | Symantec AntiVirus Quarantined |
| VBO file extension | Microsoft Corporation | Microsoft Access Package Deployment References |
| VBOX-EXTPACK file extension | Oracle | VirtualBox Extension Format |
| VBT file extension | PC Tools | Spyware Doctor Temporary Scan Format |
| VBTLOG file extension | VBTheory | VBTheory Calculator |
| VC2 file extension | Wholly Genes, Inc. | The Master Genealogist Genealogy Chart |
| VCB file extension | VMware, Inc. | VMware Consolidated Backup |
| VCC file extension | G7 Productivity Systems, Inc. | VersaCheck |
| VCH file extension | Wholly Genes, Inc. | Master Genealogist Genealogy Chart |
| VDAT file extension | Carina Software | SkyGazer Data |
| VDF file extension | VirtualDub | VirtualDub Filter Plug-in Format |
| VDI file extension | StepMania | StepMania Debug Resource Format |
| VDJSEND file extension | Atomix Productions | VirtualDJ Send Format |
| VDOC file extension | N/A | Superior SQL Builder Project |
| VDPLUGIN file extension | Avery Lee | VirtualDub Plugin |
| VDZ file extension | Schneider Electric S.A. | Schneider Vijeo Designer Project |
| VEL file extension | NEPLAN | NEPLAN Network Differences |
| VER file extension | N/A | Version Description Format |
| VERSION file extension | Various Linux developers | Linux Gated Daemon |
| VERT file extension | N/A | QT Shader |
| VES file extension | PPCL | C Visual Explorer Saved State |
| VET file extension | M.Carson | Ribbons Surface |
| VEW file extension | N/A | Novell GroupWise E-mail View |
| VFP file extension | N/A | TMPGEnc VFAPI Extension |
| VFS file extension | N/A | Virtual File System Index |
| VFX file extension | Hash, Inc. | Animation Master Volumetric Effect Extension |
| VH file extension | Microsoft Corporation | WinHelp VH |
| VHDDAT file extension | Totem Entertainment | VirtuaGirl HD Model Package Data |
| VHDDLD file extension | Totem Entertainment | VirtuaGirl HD |
| VHDINF file extension | Totem Entertainment | VirtuaGirl HD Model Package Installation |
| VHDSHOWS file extension | Totem Entertainment | VirtuaGirl HD Video Show |
| VHDTRAILERS file extension | Totem Entertainment | VirtuaGirlHD Video Trailer |
| VHM file extension | DCC Corporation | HotMux Thermocouple Data Log |
| VI1 file extension | Kaspersky Lab | Kaspersky Anti-Virus |
| VI2 file extension | Kaspersky Lab | Kaspersky Anti-Virus |
| VIB file extension | ChemSoft Ltd. | Chemsoft Export/Import MSDS Data |
| VIH file extension | N/A | Video Metadata |
| VIR file extension | Symantec | Virus Infected Format |
| VIT file extension | National Instruments Corporation | LabVIEW Virtual Instrument Template |
| VIX file extension | N/A | ACUCOBOL-GT Index |
| VJB file extension | Aivosto Oy | Visustin Job |
| VJSPROJ file extension | Microsoft Corporation | Microsoft Visual J# Project |
| VKF file extension | SUU Design | Videonizer Activation Key |
| VLB file extension | Corel Corporation | Corel Ventura Library |
| VLCL file extension | VMware | VMware Localization Format |
| VLD file extension | The Database Managers, Inc. | DataFlex Variable Length Datafile |
| VLM file extension | Novell, Inc. | Novell Netware Virtual Loadable Module |
| VLMC file extension | VideoLAN Project Team | VLMC Project |
| VLR file extension | Church House Publishing | Visual Liturgy Lectionary Plan |
| VMAP file extension | Mangos Foundation | ManGoS |
| VMB file extension | Intuit Inc. | Quicken 2002 Order |
| VMBX file extension | Hewlett-Packard Company | HP TRIM Outlook Saved Message |
| VMDK-CONVERTTMP file extension | VMWare | VMware Fusion Temporary Format |
| VMEM file extension | VMware, Inc. | VMware Virtual Machines Paging |
| VMF_AUTOSAVE file extension | Valve | Valve Hammer Editor Auto Save Format |
| VMG file extension | Nokia | Nokia Saved Text Message Format |
| VMHF file extension | VMware | VMware ACE Hot Fix Format |
| VMHR file extension | VMware | VMware ACE Hot Fix Format |
| VMLOG file extension | VMware, Inc. | VMware Replay Recording |
| VMOAPP file extension | VMware, Inc. | VMware VCenter Orchestrator Application |
| VMOD file extension | The VASSAL Team | Vassal Module |
| VMP file extension | Future Corporation Ltd | VinylMaster Pro |
| VMR file extension | Code Architects S.r.l. | VBMaximizer |
| VMSG file extension | VMware | VMware Log Format |
| VMXA file extension | VMware, Inc. | VMware ACE Master Configuration |
| VNCLOC file extension | Apple | Apple Mac OS X Screen Sharing Internet Location Format |
| VNS file extension | CNet | Visual Net Server |
| VOCA file extension | Julius development team | Julius Vocabulary |
| VOL file extension | N/A | Volfs File System Directory |
| VOM file extension | N/A | Viseme Mapping |
| VOP file extension | Civica Infrastructure | Visual OTTHYMO Project |
| VOR file extension | Sun Microsystem | OpenOffice.org Or StarOffice Template Format |
| VPA file extension | Halsoft | VPchat Chat Gestures Format |
| VPC6 file extension | Microsoft | Virtual Machine Package Format |
| VPC7 file extension | N/A | Virtual Machine Package Format |
| VPLUGIN file extension | Robot Entertainment, Inc | Orcs Must Die! Plugin |
| VPO file extension | TangentCats | VASTprogrammer |
| VPU file extension | AVAST Software a.s. | Avast! Update Package |
| VPW file extension | SlickEdit | SlickEdit Workspace |
| VR1 file extension | Graitec | Advance Design Results |
| VRGE08TASK file extension | Microsoft Corporation | Microsoft Entourage 2008 Task |
| VRJ file extension | AOL Inc. | Netscape Navigator |
| VRM file extension | Corel Corporation | Corel Quattro Pro Overlay |
| VRT file extension | N/A | Viscape For Netscape Navigator |
| VS file extension | N/A | Vivid Include Format |
| VS1 file extension | N/A | Vistumbler Export |
| VS3 file extension | N/A | VSampler |
| VSDIR file extension | Microsoft Corporation | Microsoft Visual Studio IDE NewFileItems |
| VSF file extension | SimPhonics, Inc. | V+ VComm Signal Or Record |
| VSIX file extension | Microsoft | Microsoft Visual Studio Format |
| VSIXMANIFEST file extension | Microsoft Corporation | Microsoft Visual Studio VSIX Manifest |
| VSL file extension | Microsoft | Visio Add-on |
| VSO file extension | NVIDIA Corporation | NVidia Compiled Vertex Shader |
| VSSCC file extension | Microsoft Corporation | Microsoft Visual Studio Temporary |
| VST file extension | Steinberg | VST Audio Plug-in Format |
| VST3 file extension | N/A | Cubase Plugin |
| VSTO file extension | Microsoft Corporation | Microsoft Visual Studio |
| VSWP file extension | VMware, Inc. | VMware Virtual Memory |
| VTBL file extension | Engineered Software, Inc. | PIPE-FLO Professional Valve Data Table |
| VTC file extension | Rainer Goebel | BrainVoyager QX Functional Data |
| VTI file extension | Kitware, Inc. | Visualization Toolkit Image Data |
| VTL file extension | Martin Brunner | Vocabulary Trainer |
| VTP file extension | Crestron Electronics, Inc. | VTPro-E Project |
| VTR file extension | Kitware, Inc. | Visualization Toolkit Rectilinear Grid Data |
| VTS file extension | Kitware, Inc. | ParaView VTK Structured Grid |
| VTSCR file extension | Visual Trading Systems | Visual Trading Systems |
| VTT file extension | Crestron Electronics, Inc. | VisionTools Pro-e Project |
| VTU file extension | Kitware, Inc. | Visualization Toolkit Unstructured Points Data |
| VWR file extension | N/A | Ixia IxVeriWave RAW 802.11 Capture |
| VWS file extension | SmartWare Corporation | SmartWare Standard View |
| VX file extension | Opera Software ASA | Opera |
| VXE file extension | Agilent Technologies | Agilent VEE Runtime Program |
| VXF file extension | Microsoft Corporation | Microsoft Money |
| VXP file extension | Intel Corporation | Intel VTune Performance Monitor Pack And Go |
| VXT file extension | Vector Informatik GmbH | Test Automation Editor XML Test Module |
| VZD file extension | Integration New Media, Inc. | INM VizionDB |
| VZR file extension | Panda Security | Sinowal.vzr Malware |
| VZX file extension | Integration New Media, Inc. | INM VizionDB |
| W20 file extension | Microsoft Corporation | Windows 2000 Related |
| W2M file extension | Gailius Raskinis | Solo Explorer Transcription |
| W2P file extension | X-Volt Studios | Webit |
| W31 file extension | Microsoft Corporation | Windows 3.1 Startup |
| W3L file extension | N/A | W3launch |
| W44 file extension | dataBased Intelligence, Inc. | DBASE Temporary |
| W95 file extension | Microsoft Corporation | Windows 95 Data |
| W98 file extension | Microsoft Corporation | Microsoft Windows 98 Related Data |
| WA0 file extension | MAGIX AG | Magix Music Studio |
| WAC file extension | www.wiscocomputing.com | WISCO Accounts Storage |
| WAF file extension | N/A | Microsoft Internet Explorer For Mac Cache |
| WAJ file extension | Softomotive Ltd | WinAutomation |
| WAL file extension | N/A | Winamp 3 Skin Format |
| WAT file extension | IBM | IBM Voice Type Languages Map |
| WB file extension | Apple, Inc. | Apple Logic Studio WaveBurner Document |
| WBA file extension | Stardock | WindowBlinds Desktop Visual Style |
| WBDP file extension | ANSYS Inc. | ANSYS Workbench Project Global |
| WBF file extension | Dataconomy Inc. | Workbook Data |
| WBO file extension | The Database Managers, Inc. | DataFlex Web Business Object |
| WBP file extension | Orgadata AG | Orgadata LogiKal |
| WBPJ file extension | ANSYS Inc. | ANSYS Workbench Project |
| WC file extension | Valve Corporation | WorldCraft |
| WCH file extension | Corel Corporation | Corel WordPerfect Macro Facility |
| WCINV-MS-P2P file extension | Microsoft Corporation | Windows Meeting Space |
| WCK file extension | Bentley Systems, Incorporated | WaterCAD |
| WCL file extension | Quanser Consulting Inc. | WinCon Controller Library |
| WCM file extension | Microsoft | Microsoft Works Communications Script Format |
| WCST file extension | Telestream | Wirecast Document |
| WCT file extension | Fairlogic Systems | WordCast Project |
| WCXF file extension | N/A | WorldCard Exchange |
| WDD file extension | Autodesk, Inc. | AutoCAD Electrical Description List |
| WDGP file extension | Microsoft Corporation | Word For Mac Add-in |
| WDIC file extension | Microsoft Corporation | Word 5 For Mac Extension |
| WDLL file extension | Microsoft Corporation | Word 6 For Mac Add-in |
| WDN file extension | Autodesk, Inc. | AutoCAD Electrical Project-related |
| WDSEML file extension | Mozilla | Mozilla Thunderbird Mail Message Format |
| WDT file extension | SYNAMETIRCS | WinSQL Schema Diff Template |
| WDV file extension | Systems, Software, Technology Incorporated | TracePlus Web Detective |
| WDX file extension | Ghisler Software GmbH | Total Commander Content Plugin |
| WDY file extension | PC SOFT | WINDEV Run-time Template |
| WEBINAR file extension | Citrix Systems, Inc. | GoToWebinar Session |
| WEBINFO file extension | Microsoft Corporation | Visual Studio .NET |
| WEBPART file extension | Microsoft Corporation | Microsoft SharePoint Web Part |
| WEBTESTRESULT file extension | Microsoft Corporation | Microsoft Visual Studio Web Test Result |
| WEF file extension | Microsoft Corporation | Exchange File System Format |
| WEIGHTOUTPUT file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Sequence |
| WEIGHTS file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Sequence Weights |
| WET file extension | SYNAMETIRCS | WinSQL Export Template |
| WF1 file extension | Quantitative Micro Software | EViews Work |
| WFF file extension | ixellence GmbH | Dataplore Wavelet Filter |
| WFK file extension | Embarcadero Technologies, Inc. | Delphi |
| WFL file extension | Ultimus | Offline Design For Workflow Process |
| WFLOW file extension | Apple, Inc. | Apple Mac OS X Automator Workflow |
| WFO file extension | Embarcadero Technologies, Inc. | Delphi Runimage |
| WFV file extension | Click&DECiDE | DataSet Vision Query Report |
| WFX file extension | Symantec Corporation | WinFax |
| WGN file extension | Grassland, Soil & Water Research Laboratory | SWAT Wather Generator Input |
| WGS file extension | ChannelAdvisor | Walk-Graph Segment |
| WHLP file extension | Microsoft Corporation | Microsoft Word For Mac Help |
| WHM file extension | cPanel | WebHost Manager |
| WIF file extension | N/A | Weaving Information Format |
| WIFF file extension | AB SCIEX | AB SCIEX Windows Interchange File Format |
| WINMD file extension | N/A | Windows Runtime Metadata Output |
| WIP file extension | CyberScrub LLC. | CyberScrub Privacy Suite Wipe |
| WIPEINFO file extension | Symantec Corporation | Norton Utilities Sendto |
| WIPESLACK file extension | Symantec Corporation | Norton Utilities Sendto |
| WIRE file extension | N/A | Wavefront Studio Wireframe |
| WIT file extension | Christophe Guibert | WebIdeaTree Project |
| WIX file extension | Xara Group Limited. | Xara Internal Graphics Data |
| WIXLIB file extension | Microsoft Corporation | WiX Library |
| WIXMSP file extension | Microsoft Corporation | WiX XML Patch |
| WIXMST file extension | Microsoft Corporation | WiX Transform |
| WIXOBJ file extension | Microsoft Corporation | WiX Object |
| WIXPDB file extension | Microsoft Corporation | WiX Debug |
| WIXPROJ file extension | Microsoft Corporation | WiX Windows Installer XML Project |
| WJE file extension | Mariner Software | WinJournal Entry Format |
| WJF file extension | Mariner Software | WinJournal Journal Format |
| WL file extension | www.wiscocomputing.com | WISCO Word Power Word Lists And Definitions |
| WLC file extension | Microsoft Corporation | Microsoft Live Mesh |
| WLG file extension | Porpoise Media | Well Logger V1 |
| WLK file extension | Davis Instruments, Corp | Weatherlink Data |
| WLL file extension | Microsoft | Microsoft Word Add-in Format |
| WLS file extension | Dataland Software | Web Log Storming Log Analysis Project |
| WLT file extension | NobleTech Limited. | Words Of Worship |
| WLX file extension | Microsoft | Microsoft Live Mesh Placeholder Format |
| WLZ file extension | Nullsoft | Winamp Language Pack Format |
| WM2D file extension | Design Simulation Technologies, Inc. | Working Model 2D Data |
| WMB file extension | Conitec Datasystems, Inc | 3D GameStudio Map Entity |
| WMI file extension | WorldMate Inc. | WorldMate Itinerary Data |
| WMR file extension | All Alex Inc. | Windows Media Recorder |
| WMU file extension | Wider Networks | WIND Tunnel WIND |
| WNA file extension | Wider Networks | WIND Tunnel Assignment |
| WND file extension | Grassland, Soil & Water Research Laboratory | SWAT Wind Speed Input |
| WNU file extension | Wider Networks | WIND Tunnel UMTS Measurement Data |
| WO file extension | The Database Managers, Inc. | DataFlex Web Object |
| WOCK file extension | ROUTE 66 Switzerland GmbH | Route 66 For Mac |
| WOG file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Obstacle Group |
| WOO file extension | Apple, Inc. | Apple WebObjects |
| WORDLIST file extension | Mariner Software | Desktop Poet Word List Format |
| WOV file extension | Cakewalk, Inc. | Cakewalk SONAR Cache Clip |
| WOWSL file extension | WOW Slider | WOW Slider Plugin |
| WP1 file extension | Eawag | MODAWEC Output Data |
| WP2 file extension | N/A | Winplot |
| WPN file extension | Intellicate, Ltd. | Schedule24 Schedule |
| WPR file extension | Apple, Inc. | Apple Logic Studio WaveBurner Plug-in Preset |
| WPRD file extension | Microsoft Corporation | Microsoft Word For Mac Print |
| WPZ file extension | Naviter d.o.o. | SeeYou Waypoint |
| WQL file extension | Microsoft Corporation | Microsoft Office |
| WRAP file extension | Aladdin Systems, Inc. | ShrinkWrap MAC |
| WRAPPER file extension | The GNOME Project | Gnome Desktop |
| WRD file extension | macropool GmbH | WebResearch |
| WRG file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Resource Grid |
| WRM file extension | WinRADiO Communications | WinRAdiO Memory Format |
| WRR file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Roughness Rose |
| WSB file extension | N/A | Microsoft SharePoint Server 2007 Temporary |
| WSE file extension | Symantec Corporation | Wise File Format |
| WSG file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Site Locations |
| WSL file extension | In-Situ Inc. | Win-Situ Data Logger |
| WSMDI file extension | Microsoft Corporation | Microsoft Visual Studio Test List |
| WSR file extension | AussieSoft | Crossword Genius |
| WSS file extension | ReliaSoft Corporation | ReliaSoft RGA |
| WSSP file extension | CommuniGate System | CommuniGate Custom Website Definition |
| WSV file extension | Konica Minolta Holdings, Inc. | Konica Minolta SpectraMagic Data |
| WSW file extension | Aignesberger Software GmbH | WebSite-Watcher Bookmark |
| WSZ file extension | N/A | Winamp Skin Zip Format |
| WT6 file extension | Software602, Inc. | 602Pro PC Suite Extension |
| WTA file extension | N/A | WinTune DLL Dynamic Link Library |
| WTC file extension | Logitech | Logitech Web Camera Format |
| WTFAV file extension | N/A | Watchtower Library Favourite |
| WTG file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Wind Turbine Generator |
| WTH file extension | NIST | ContamX Weather |
| WTMP file extension | Microsoft Corporation | Microsoft Word For Mac 5 Temporary |
| WTS file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Wind Turbine Site |
| WTT file extension | Likno Software Inc. | Likno Web/HTML Tooltips Builder |
| WUI file extension | Ipswitch, Inc. | WhatsUp Gold Network Map Polling Statistics |
| WUL file extension | WinUHA | WinUHA Language Format |
| WUP file extension | Ipswitch, Inc. | WhatsUp Gold Network Map |
| WVD file extension | Star Finanz GmbH | StarMoney Filter Zvl32 |
| WVM file extension | Ricardo plc. | WAVE Input |
| WW6 file extension | Nolo | Nolo Willmaker 6 Will |
| WWCX file extension | Adobe Systems Incorporated | Adobe InCopy |
| WWD file extension | Microsoft | Microsoft Works Wizards Format |
| WWG file extension | SINTEF | CARE-S InfoWorks Wastewater Data |
| WWL file extension | Microsoft Corporation | Microsoft Word Add-in |
| WWQ file extension | Grassland, Soil & Water Research Laboratory | SWAT Watershed Water Quality Input |
| WWR file extension | Wind Energy Division at Risø DTU, Denmark | WAsP Resource Grid |
| WWS file extension | Microsoft Corporation | Microsoft Autoroute User Information |
| WXF file extension | SYNAMETIRCS | WinSQL Scheduled Task |
| WXR file extension | wxWidgets Team | WxWindgets Resource |
| WYC file extension | wyDay | WyBuild Version Number |
| WYU file extension | wyDay | WyBuild Update |
| WZMUL file extension | Corel | WinZip Multi-user Registration Format |
| X01 file extension | Corel Corporation | Corel Paradox Secondary Index |
| X02 file extension | Corel Corporation | Corel Paradox Secondary Index |
| X03 file extension | Corel Corporation | Corel Paradox Secondary Index |
| X04 file extension | Corel Corporation | Corel Paradox Secondary Index |
| X05 file extension | Corel Corporation | Corel Paradox Secondary Index |
| X06 file extension | Corel Corporation | Corel Paradox Secondary Index |
| X07 file extension | Corel Corporation | Corel Paradox Secondary Index |
| X08 file extension | Corel Corporation | Corel Paradox Secondary Index |
| X09 file extension | Corel Corporation | Corel Paradox Secondary Index |
| X1 file extension | X1 Technologies, Inc. | X1 Desktop Search Saved Search |
| X32 file extension | Adobe Systems | Adobe Xtra Format |
| XAB file extension | Microsoft Corporation | Microsoft Outlook Express Address Book |
| XADD file extension | Microsoft | Expression Web Add-in |
| XBA file extension | Oracle | OpenOffice.org Basic Module Format |
| XBB file extension | DVIPDFMx Project Team | DVIPDFMx Output |
| XBD file extension | Fuji Xerox Co., Ltd. | Fuji Xerox Docuworks |
| XBN file extension | HyperG/Smuggl0r | Xnick Nick Backup |
| XCO file extension | Xilinx, Inc. | Xilinx CORE Generator Log |
| XCODEPLUGIN file extension | Apple, Inc. | Apple Xcode Extension |
| XCOF file extension | Apple, Inc. | Mac OS Object Library |
| XCORPUS file extension | University of Oxford | Xaira Corpora |
| XCPLUGIN file extension | Apple, Inc. | Apple Xcode Extension |
| XCPLUGINDATA file extension | Apple, Inc. | Xcode Plug-in Data |
| XCTL file extension | National Instruments Corporation | LabVIEW XControls |
| XCUSERSTATE file extension | Apple, Inc. | Xcode |
| XDF file extension | Autodesk, Inc. | Externally Defined Function |
| XDO file extension | Oracle Corporation | Oracle BI Publisher Resource Tracking |
| XDT file extension | Olivier F5MZN | Win-Test Extra Data |
| XDU file extension | N/A | Backdoor.Win32.PcClient.xdu |
| XDV file extension | N/A | XeTeX |
| XENSEARCH file extension | Citrix | XenCenter Saved Search Format |
| XEO file extension | Signwave UK | Signwave Auto-Illustrator Extension |
| XEQ file extension | The Sage Group plc | Sage MAS 90 Data |
| XEVGENXML file extension | Adobe Systems Incorporated | Adobe Dreamweaver |
| XFI file extension | LaTeX Project Development Team | Latex Figures |
| XFZ file extension | Declan Software | French FlashCards Vocabulary |
| XG0 file extension | Corel Corporation | Corel Paradox Secondary Index |
| XG1 file extension | Corel Corporation | Corel Paradox Secondary Index |
| XG2 file extension | Corel Corporation | Corel Paradox Secondary Index |
| XG3 file extension | Corel Corporation | Corel Paradox Secondary Index |
| XG4 file extension | Corel Corporation | Corel Paradox Secondary Index |
| XG5 file extension | Corel Corporation | Corel Paradox Secondary Index |
| XGD file extension | Microsoft Corporation | Xbox 360 Game Disc Layout |
| XGO file extension | GeoConcept SA | GeoConcept Add-on |
| XHB file extension | N/A | HomeBank Data |
| XHP file extension | OpenOffice.org Project Team | OpenOffice.org Extension Help Format |
| XIL file extension | SourceForge.net | Xilize |
| XIT file extension | New River Kinematics | SpatialAnalyzer |
| XIT64 file extension | New River Kinematics | SpatialAnalyzer |
| XIX file extension | N/A | IIS NNTP Subject Lists |
| XIZ file extension | SourceForge.net | Ximinez |
| XKM file extension | Various Linux developers | X KeyBoard |
| XLA file extension | Microsoft | Microsoft Excel Add-in Format |
| XLA5 file extension | Microsoft Corporation | Microsoft Excel 5 For Mac Add-in |
| XLA8 file extension | Microsoft Corporation | Microsoft Excel 98 For Mac Add-in |
| XLAM file extension | Microsoft | Microsoft Excel 2007/2010 Open XML Macro-enabled Add-in Format |
| XLA_ file extension | Microsoft Corporation | Microsoft Excel 4 For Mac Add-in |
| XLDB file extension | PRIORITY DISPATCH CORP. | AQUA Data |
| XLG file extension | Autodesk, Inc. | AutoCAD External Reference Log |
| XLI file extension | Siemens Product Lifecycle Management Software Inc. | SIEMENS PLM Software NX 7.5 Log |
| XLL file extension | Microsoft | Microsoft Excel Add-in Format |
| XLL_ file extension | Microsoft Corporation | Microsoft Excel 4 For Mac Add-in |
| XLNK file extension | N/A | XML Link Format |
| XLV file extension | Microsoft | Microsoft Excel VBA Module Format |
| XLW file extension | Microsoft | Microsoft Excel Workspace Format |
| XLZ file extension | CPT | Crossword Power Tools Crossword Library |
| XMEF file extension | LexisNexis | TextMap Evidence Format |
| XMIT file extension | N/A | IBM XMIT Data |
| XML-PREV file extension | Oracle Corporation | VirtualBox XML Settings Backup |
| XMOD file extension | Datawatch Corporation | Datawatch Monarch Model |
| XMP file extension | Adobe Systems | Adobe Extensible Metadata Platform Format |
| XMPSES file extension | Adobe Systems Incorporated | Adobe Premiere Elements |
| XMS file extension | Autodesk, Inc. | AutoCAD External Message |
| XMX file extension | Autodesk, Inc. | AutoCAD External Message Compiled |
| XND file extension | Logistical Computing and Internetworking (LoCI) Laboratory | ExNode Download |
| XNK file extension | N/A | Microsoft Exchange Shortcut Format |
| XNODE file extension | National Instruments Corporation | LabVIEW |
| XNP file extension | N/A | XnView Addon |
| XNT file extension | Quark | QuarkXPress Extension Format |
| XNV file extension | N/A | NVision Layout |
| XOB file extension | Nematron | EasyBuilder 8000 Compiled Code |
| XOL file extension | Sybase | Sybase PowerDesigner Object Language Format |
| XOP file extension | N/A | IGOR Pro Add-on |
| XPF file extension | GNU XaoS Contributors | XaoS Position |
| XPR file extension | Medea International | PressIt CD Label Format |
| XPS~ file extension | Stardock Corporation | WindowBlinds Temporary |
| XPT file extension | N/A | Mozilla Firefox Component |
| XPTIN file extension | XP Solutions Inc. | Xpswmm Hydrology Data |
| XPW file extension | Intercon Associates Inc. | Accessible FormNet Fillable Form |
| XPX file extension | Intercon Associates Inc. | Intercon FormNet |
| XPY file extension | Leading Market Technologies, Inc. | MarketBrowser |
| XP~ file extension | Stardock Corporation | WindowBlinds Temporary |
| XRDML file extension | PANalytical B.V. | PANalytical XRD Measurement Data XML |
| XREF file extension | IBM | IBM AIX Cross Reference |
| XRL file extension | Sybase Inc. | PowerDesigner Report |
| XRS file extension | RealNetworks, Inc. | RealPlayer Plugin External Resources |
| XSIADDON file extension | Autodesk | SOFTIMAGE XSI Add-on Format |
| XSLIC file extension | Citrix | XenServer License Format |
| XSO file extension | Ultrapico | Expresso Project |
| XSR file extension | Bentley Systems, Incorporated | GEOPAK XS-List Report |
| XSSLOG file extension | Microsoft Corporation | Microsoft SharePoint WorkSpace Groove Log |
| XSSR file extension | Microsoft Corporation | Microsoft SharePoint WorkSpace Groove |
| XSTB file extension | Nuance Communications, Inc. | TextBridge |
| XSTK file extension | xStarter Solutions, Inc. | XStarter Task |
| XSU file extension | IBM | Fortran 77 Library |
| XTF file extension | N/A | EXtended Triton Format |
| XTIC file extension | Promethean World plc | ActivInspire Ticker |
| XTMP file extension | Avid Technology, Inc. | Avid Xpress Pro Template |
| XTND file extension | N/A | Adobe Acrobat For Mac Plug-In |
| XTRA file extension | Adobe Systems Incorporated | Adobe Director Xtra |
| XTRL file extension | N/A | XTND Translator |
| XVO file extension | RatDVD.CA | RatDVD Internal |
| XWF file extension | Nuance Communications | OmniPage Workflow Format |
| XXX file extension | Compucon USA | Compucon/Singer PSW Embroidery Design Format |
| XZM file extension | Slackware Linux, Inc. | Slackware Linux Package |
| Y01 file extension | Corel Corporation | Corel Paradox Secondary Index |
| Y02 file extension | Corel Corporation | Corel Paradox Secondary Index |
| Y03 file extension | Corel Corporation | Corel Paradox Secondary Index |
| Y04 file extension | Corel Corporation | Corel Paradox Secondary Index |
| Y05 file extension | Corel Corporation | Corel Paradox Secondary Index |
| Y06 file extension | Corel Corporation | Corel Paradox Secondary Index |
| Y07 file extension | Corel Corporation | Corel Paradox Secondary Index |
| Y08 file extension | Corel Corporation | Corel Paradox Secondary Index |
| Y09 file extension | Corel Corporation | Corel Paradox Secondary Index |
| YAH file extension | CousySoft | HeartBeat |
| YAST file extension | OpenSUSE | YaST |
| YBD file extension | EZC Group | YobiDrive Link Format |
| YBK file extension | Microsoft | Microsoft Encarta Yearbook Format |
| YBM file extension | Lavasoft | Ad-Aware 2007 |
| YCT file extension | David Binette | YahELite Chat Transcript |
| YG0 file extension | Corel Corporation | Corel Paradox Secondary Index |
| YG1 file extension | Corel Corporation | Corel Paradox Secondary Index |
| YG2 file extension | Corel Corporation | Corel Paradox Secondary Index |
| YG3 file extension | Corel Corporation | Corel Paradox Secondary Index |
| YG4 file extension | Corel Corporation | Corel Paradox Secondary Index |
| YGN file extension | Spacejock Software | YGen |
| YMAP file extension | MindGenius Ltd. | MindGenius Computer Aided Thinking Format |
| YMBK file extension | Xilisoft Corporation | Xilisoft Mobile Manager Phonebook |
| YMG file extension | Yahoo! | Yahoo! Messenger Format |
| YOS file extension | Hewlett-Packard Company | HP Photosmart Essential Thumbnail Cache |
| YPS file extension | Yahoo! | Yahoo! Instant Messenger Format |
| YSE file extension | Yamaha Corporation | Yamaha Studio Manager Session |
| YSM file extension | Yamaha Corporation | Yamaha Studio Manager |
| YSS file extension | YcySoft | YcySoft Screen Saver Producer |
| YTI file extension | Google Inc. | Google Picasa Plugin |
| YTR file extension | I.R.I.S. s.a. | I.R.I.S. OCR Data |
| YW3 file extension | Spacejock Software | YWriter 3 Project |
| YW4 file extension | Spacejock Software | YWriter 4 Project |
| YW5 file extension | Spacejock Software | YWriter 5 Project |
| YWEMANIFEST file extension | Yahoo, Inc. | Yahoo! Widgets Manifest |
| YWL file extension | Repkasoft | YoWindow Data |
| Z0 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed JS |
| Z1 file extension | Check Point Software Technologies | ZoneAlarm Mailsafe Renamed VB Format |
| Z2 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| Z3 file extension | Check Point Software Technologies Ltd. | Zonealarm Mailsafe Renamed |
| Z32 file extension | Zero Assumption Recovery | ZAR32 Progress Data Save |
| Z4 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| Z5 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| Z6 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| Z7 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| Z9 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZAC file extension | STI International | Spirit Architectural Component |
| ZAK file extension | Carlson Software | Sight Survey Job |
| ZAM file extension | ZTree | ZTreeWin Application Menu |
| ZAPC file extension | ArcSoft, Inc. | ArcSoft Print Creations Creation |
| ZAX file extension | Herman Miller | Z-Axis 3-D Office Design Software Related |
| ZBF file extension | ZEMAX Development Corporation | ZEMAX Beam |
| ZBI file extension | N/A | Zeus Special Tags |
| ZCN file extension | Nuance Communications, Inc. | OmniPage Data |
| ZCP file extension | CAD Graphics West Incorporated | Dimension Magics Printing |
| ZCT file extension | ZeitControl cardsystems GmbH | ZeitControl Terminal Program |
| ZDX file extension | Avery Dennison Corporation | Avery Design Clipart Index |
| ZEM file extension | Zope Foundation | Zope External Editor |
| ZEN file extension | ZEMAX Development Corporation | ZEMAX Face Number |
| ZEON file extension | e-on software, inc. | E-on Installation Archives |
| ZEXP file extension | Zope Foundation | Zope Binary Export Data |
| ZFC file extension | NavisWorks | Z+F Scan |
| ZFS file extension | NavisWorks | Z+F Scan |
| ZGI file extension | MarketTools | Zoomerang Web Survey Page |
| ZGT file extension | N/A | Oren Scientific Word Processor |
| ZGY file extension | Schlumberger Limited | Petrel Compressed Seismic Data |
| ZH file extension | AOL Inc. | Netscape Communicator Java Classes |
| ZID file extension | Philippe Grosjean | Zoo/PhytoImage Data |
| ZIR file extension | R. Grothmann | Compass And Ruler Figure |
| ZKA file extension | Intuit Inc. | Quicken Win Version 6 |
| ZKX file extension | Zix Corporation | ZixCorp Signature |
| ZL0 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed ADE |
| ZL1 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed ADP |
| ZL2 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed BAS |
| ZL3 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed BAT |
| ZL4 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed CHM |
| ZL5 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed CMD |
| ZL6 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed COM |
| ZL7 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed CPL |
| ZL8 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed CRT |
| ZLA file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed HLP |
| ZLB file extension | AutoDesSys | Form•Z Symbol Library Format |
| ZLC file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed INF |
| ZLD file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed INS |
| ZLE file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed ISP |
| ZLF file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed JSE |
| ZLG file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed LNK |
| ZLH file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed MDB |
| ZLI file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed MDE |
| ZLJ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed MSC |
| ZLK file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed MSI |
| ZLL file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed MSP |
| ZLM file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed MST |
| ZLN file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed PCD |
| ZLO file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed PIF |
| ZLP file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed REG |
| ZLQ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed SCR |
| ZLR file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed SCT |
| ZLS file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed SHS |
| ZLT file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed URL |
| ZLU file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed VBE |
| ZLV file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed VBS |
| ZLW file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed WSC |
| ZLX file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed WSF |
| ZLY file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed WSH |
| ZLZ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed ASX |
| ZM0 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed DBX Ile |
| ZM1 file extension | Check Point | ZoneAlarm Mailsafe Renamed MDA Format |
| ZM2 file extension | Check Point | ZoneAlarm Mailsafe Renamed MDZ Format |
| ZM3 file extension | Check Point | ZoneAlarm Mailsafe Renamed NCH Format |
| ZM4 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed PRF |
| ZM5 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed SCF |
| ZM6 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed SHB |
| ZM7 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed WMS |
| ZM8 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed MHT |
| ZM9 file extension | Check Point Software Technologies | ZoneAlarm Mailsafe Renamed ZIP Format |
| ZMA file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed RAR |
| ZMB file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed DLL |
| ZMD file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed OCX |
| ZME file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed SYS |
| ZMF file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMG file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMI file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMK file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZML file extension | Zoomorama | Zoomcreator Zooming Scene Description Format |
| ZMM file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMN file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMP file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMQ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMR file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMS file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMT file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMU file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMW file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMX file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMY file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZMZ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN0 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN1 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN2 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN3 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN4 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN5 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN6 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN7 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN9 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNA file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNB file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNC file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNCN file extension | N/A | RMCProfile List |
| ZND file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNE file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNF file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNG file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNH file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNI file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNJ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNK file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNL file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNM file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNN file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNP file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNQ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNR file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNS file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNT file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNU file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNV file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNW file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNX file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNY file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZNZ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZN~ file extension | Zinio Systems | Zinio Reader Temporary |
| ZO0 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZO1 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZO2 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZO3 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZO4 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZO5 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZO6 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZO7 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZO8 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZO9 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOA file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOB file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOC file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOD file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOE file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOF file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOG file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOH file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOI file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOJ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOK file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOL file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOM file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZONER-INDEX-CACHE file extension | ZONER, Inc. | Zoner Photo Studio Index Cache |
| ZONER-RAWDATA-CACHE file extension | ZONER, Inc. | Zoner Photo Studio Raw Data Cache |
| ZOP file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOQ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOR file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOS file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOT file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOU file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOV file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOW file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOX file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOY file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZOZ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZP0 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZP1 file extension | ACOS PM GmbH | ACOS PLUS.1 Project Management Data And Workaround |
| ZP4 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZP5 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZP7 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZPAK file extension | N/A | Sony Ericsson Xperia Play Game Pack |
| ZPB file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe |
| ZPD file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZPJ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZPK file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZPM file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZPO file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZPP file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZPQ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZPR file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZPU file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZQ0 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZQ3 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZQC file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZQD file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZQV file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZQY file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZQZ file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZR2 file extension | N/A | ZoneAlarm Mailsafe Renamed |
| ZR3 file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZRP file extension | VMware, Inc. | VMware Unix Agent Debug |
| ZSF file extension | Zend Technologies Ltd. | Zend Server Event |
| ZSN file extension | ACOS PM GmbH | ACOS Plus 1 Project |
| ZSP file extension | RJS Software | WinView /400 Compressed Report |
| ZSR file extension | AutoDesSys, Inc. | Form-Z Temporary Save |
| ZTE file extension | E-Tabs Limited | E-Tabs Reader |
| ZTF file extension | Avanquest | DVD Label Template Format |
| ZTG file extension | ZEMAX Development Corporation | ZEMAX Table Glass |
| ZTK file extension | Zope Foundation | Zope Toolkit |
| ZTR file extension | Avanquest | DVD Label Template Media Format |
| ZTT file extension | Universität Zürich | Z-Tree |
| ZVPL file extension | Visual Paradigm | Visual Paradigm For UML License Key Format |
| ZWT file extension | Emerson Electric Co. | ControlWave Designer Zipped Project |
| ZXB file extension | N/A | ZX-Modules Metafile |
| ZXP file extension | Adobe Systems | Adobe Extension Package Format |
| ZYP file extension | Propellerhead Software AB | Propellerhead Reason Subtractor Synth Instrument Patch |
| ZYS file extension | Pervasive Software Inc. | Pervasive Business Integrator Database |
| ZZR file extension | Check Point Software Technologies Ltd. | ZoneAlarm Mailsafe Renamed |
| ZZS file extension | FutureSoft, Inc. | FutureSoft MultiView Script |
| ZZU file extension | FutureSoft, Inc. | FutureSoft MultiView Uninstall |
| ^FSF file extension | Artifex Software | Ghostscript |
| _501 file extension | Apple, Inc. | Apple MAC OS X |
| _EML file extension | Microsoft | Windows Mail Live Email Format |
| _GS file extension | Siber Systems, Inc. | Roboform GoodSync Data |
| _H file extension | Adobe Systems Incorporated | Adobe Type Manager Japanese Font Outline |
| _NWS file extension | Microsoft | Windows Live Mail Newsgroup Copy Format |
| _SLN file extension | Microsoft Corporation | Microsoft Visual Studio Launcher |
| _VWDXSLN90 file extension | Microsoft Corporation | Microsoft Visual Studio Launcher |
| ~$~ file extension | Boilsoft | 3GP/iPod/PSP/MP4 Converter Temporary |
| ~CR file extension | WinRecovery Software | Recovered Image |
| ~NT file extension | Microsoft Corporation | Microsoft Windows NT Install Files |
| ~~C file extension | Microsoft Corporation | Microsoft Windows Application Log |
| ~~D file extension | Microsoft Corporation | Microsoft Windows Application Log |
| ~~F file extension | Microsoft Corporation | Microsoft Windows Application Log |
| ~~G file extension | Microsoft Corporation | Microsoft Windows Application Log |
| ~~M file extension | Microsoft Corporation | Microsoft Windows Application Log |
Web Developer acting on his own, author of Internet solutions facilitating working with new technologies for less advanced users. Internet maniac.
