| File extension | Developer/Producer | File description |
|---|---|---|
| $03 file extension | Microsoft Corporation | MS-DOS Pipe Format |
| 0 file extension | N/A | Linux Shared Library Link Format |
| 143 file extension | Various Linux developers | Linux |
| 1PA file extension | Microsoft Corporation | Microsoft Windows |
| 286 file extension | Microsoft Corporation | Microsoft Windows Virtual Device Driver |
| 2FS file extension | Puppy Linux | Puppy Linux Snapshot Format |
| 2GR file extension | Microsoft Corporation | Windows VGA Graphic Drivers |
| 32S file extension | Microsoft Corporation | Win32s |
| 3FS file extension | Puppy Linux | Puppy Linux Save State Format |
| 3~6 file extension | N/A | Windows 3.xx System |
| 500 file extension | NetBSD Foundation, Inc. | Linux |
| 73U file extension | Texas Instruments | TI-73 Explorer Operating System Format |
| 8XU file extension | Texas Instruments | Texas Instruments TI-83 Plus Operating System Format |
| AAD file extension | N/A | FreeBSD |
| ACCESS file extension | Oracle Corporation | Java Access Control |
| ACCT file extension | IBM | IBM AIX System |
| ADM file extension | N/A | Administrator Policy Template Format |
| ADML file extension | Microsoft | Microsoft Administrative Language-specific XML Template Format |
| ADMX file extension | Microsoft | Microsoft Administrative XML Template Format |
| ADV file extension | N/A | Audio Driver Format |
| AIX file extension | IBM | IBM AIX |
| ANI file extension | Microsoft | Animated Cursor |
| ANN file extension | N/A | Microsoft Windows Help Annotation Format |
| AOS file extension | ARCHOS | Archos Signed Encrypted Data Format |
| APDISK file extension | Apple, Inc. | Apple Mac OS X Related |
| APPLEDOUBLE file extension | Apple, Inc. | Apple AppleDouble Resource |
| APPLE_PARTITION_MAP file extension | Apple, Inc. | Apple Partition Scheme |
| AQL file extension | N/A | AOL DLL |
| ASEC file extension | Google Android Encrypted Application Package Format | |
| ATAHD file extension | Puppy Linux | Puppy Linux ATA Hard Drive Flag Format |
| AUG file extension | N/A | Red Hat Linux Shellvars |
| AUTOMATICDESTINATIONS-MS file extension | Microsoft | Microsoft Windows 7 Jump List Format |
| BASHRC file extension | The GNU Project | Bash Shell Startup Script Configuration Format |
| BASH_HISTORY file extension | The GNU Project | Bash History Format |
| BASH_PROFILE file extension | The GNU Project | Bash Interactive Login Shell Format |
| BBFW file extension | Apple, Inc. | ITunes Firmware |
| BCD file extension | Microsoft | Microsoft Windows Boot Configuration Format |
| BIO file extension | N/A | OS/2 BIOS Format |
| BK2 file extension | Microsoft | Windows Indexing Service Data Format |
| BLF file extension | Microsoft | CLFS Base Log Format |
| BMK file extension | Microsoft | Help Bookmarks |
| BNR file extension | Nintendo Co., Ltd. | Nintento Wii Homebrew |
| BOM file extension | Apple | Apple Mac OS X Bill Of Materials Format |
| BOOTEFISIGNATURE file extension | Apple, Inc. | Bootefisignature Mac OS X System |
| BRIDGESUPPORT file extension | Apple, Inc. | Bridgesupport Mac OS X File Extension |
| BSDIFF file extension | Red Hat, Inc. | Cygwin |
| BUD file extension | Microsoft | Binary Printer Description Format |
| C32 file extension | Syslinux | Syslinux COM32 Module |
| CAB file extension | Microsoft | Windows Cabinet Compressed Archive |
| CB file extension | Microsoft Corporation | Microsoft Clean Boot |
| CDMP file extension | Microsoft | WCS CDMP |
| CGK file extension | IVT Corporation | BlueSoleil |
| CGZ file extension | N/A | Linux Drivers Archive Format |
| CHS file extension | Microsoft | Windows Chinese Noise-Word List Format |
| CI file extension | Microsoft | Windows Content Indexer Catalog Format |
| CLB file extension | Microsoft | Com+ Catalog Format |
| CMG file extension | N/A | Cramfs ROM File System Package |
| CNT file extension | Microsoft | Help Contents Format |
| COMPONENTS file extension | Apple, Inc. | Mac OS X System |
| CONFIGPROFILE file extension | Apple | Apple Configuration Profile |
| CPI file extension | Microsoft | Codepage Information Format |
| CPL file extension | Microsoft | Microsoft Windows Control Panel Format |
| CPQ file extension | Compaq | Compaq OEM Disc Configuration Format |
| CRASH file extension | Apple | Apple Mac OS X Console Report Format |
| CRMLOG file extension | Microsoft Corporation | Microsoft Windows CRM Log |
| CRP file extension | Micro-Star International | MSI SecureDoc Encrypted |
| CTFSYS file extension | N/A | OS X Mach Kernel System |
| CUR file extension | N/A | Windows Cursor Format |
| DAT_TUREG_OLD file extension | Microsoft Corporation | Windows Registry |
| DDZ file extension | N/A | Adaptec Unix Driver |
| DESKLINK file extension | N/A | Desktop Shortcut |
| DESKTHEMEPACK file extension | Microsoft | Microsoft Windows 8 Theme Pack Format |
| DEV file extension | N/A | Windows Device Driver Format |
| DEVICEMANIFEST-MS file extension | Microsoft Corporation | Microsoft Windows Device Metadata |
| DFU file extension | Apple | Apple IOS Firmware Update Format |
| DIAGCAB file extension | Microsoft | Microsoft Windows Troubleshooting CAB Format |
| DIAGCFG file extension | Microsoft | Microsoft Windows Troubleshooting Configuration Format |
| DIAGPKG file extension | Microsoft | Microsoft Windows Troubleshooting Package Format |
| DIMAX file extension | Massoth Electronics | DiMAX Firmware Format |
| DIT file extension | Microsoft | Microsoft Windows 2000 Active Directory Schema Format |
| DLL file extension | Microsoft | Dynamic Link Library Format |
| DLX file extension | Microsoft | Renamed DLL Format |
| DMP file extension | Microsoft | Memory Dump, Screen Dump, Junk Files |
| DO7 file extension | Microsoft Corporation | DOS 7 |
| DOH file extension | Berkeley Softworks | Geoworks GEOS Dependency Information |
| DOS file extension | Microsoft Corporation | WIN95/ DOS 7 System |
| DRPM file extension | The Fedora Project | Delta RPM Format |
| DRV file extension | N/A | Microsoft Windows Device Driver |
| DSR file extension | Corel Corporation | Corel WordPerfect Driver |
| DSS file extension | N/A | DCC Active Designer Screensaver Format |
| DVD file extension | N/A | DOS Device Driver |
| DYC file extension | Xerox | Xerox Printer Driver Configuration Format |
| EBD file extension | Microsoft | Windows EBD System Format |
| EDJ file extension | Enlightenment.org | Enlightenment DR 17 Background And Theme Format |
| EFI file extension | UEFI Forum | Extensible Firmware Interface Firmware Format |
| EFIRES file extension | Apple | EFI Image Format |
| ELF file extension | Unix System Laboratories | ELF Executable Format |
| EMERALD file extension | Compiz Fusion | Emerald Theme Format |
| EQUIV file extension | IBM | IBM AIX System File. |
| ESN file extension | Microsoft Corporation | Windows XP System32 |
| ETL file extension | Microsoft | Microsoft Windows Trace Log Format |
| EVT file extension | Microsoft | Microsoft Windows 2000 And XP Event Log Format |
| EVTX file extension | Microsoft | Microsoft Windows Vista, Windows 7, Windows 8 Event Log Format |
| EXT2 file extension | Various Linux developers | Linux Second Extended System |
| FFA file extension | Microsoft | Find Fast Indexer Status Format |
| FFL file extension | Microsoft | Find Fast Indexer Document List Format |
| FFO file extension | Microsoft | Find Fast Indexer Document Properties Cache Format |
| FFX file extension | Microsoft | Find Fast Indexer Index Format |
| FOLDER file extension | Microsoft Corporation | Microsoft Windows Explorer Folder |
| FOTA file extension | Firmware Over-the-Air Format | |
| FPBF file extension | Apple | Mac OS X Finder Burnable Backup Archive |
| FSEVENTSD file extension | Apple, Inc. | MAC OS X |
| FSTAB file extension | N/A | File System Table |
| FTG file extension | N/A | Microsoft Windows Help Format |
| FTS file extension | N/A | Windows Help Index Format |
| FWL file extension | CursorArts Company | FileWrangler EXE Library |
| GMMP file extension | Microsoft | WCS GMMP Gamut Mapping Profile |
| GRL file extension | Microsoft | Microsoft Windows Update Status Format |
| GROUP file extension | Microsoft | Windows Mail Group Format |
| GRP file extension | Microsoft | Microsoft Windows Program Group Format |
| GZP file extension | Joshua Haberman | Gazelle System Page |
| H1C file extension | Microsoft Corporation | Windows Vista File Related To Assistance Platform (AP) Help |
| H1F file extension | Microsoft Corporation | Microsoft Windows Assistance Platform Client Help |
| H1K file extension | Microsoft Corporation | Keyword Index - Microsoft Windows Assistance Platform Client Help Related |
| H1S file extension | Microsoft | Microsoft Windows Assistance Platform Client Help Format |
| H1T file extension | Microsoft Corporation | Microsoft Windows Assistance Platform Client Help Related |
| H1V file extension | Microsoft Corporation | Task Metadata - Microsoft Windows Assistance Platform Client Help Related |
| HDMP file extension | Microsoft | Microsoft Windows Heap Dump Format |
| HELP file extension | Apple | Unix Help Format |
| HHC file extension | N/A | HTML Help Table Of Contents Format |
| HHK file extension | N/A | Microsoft HTML Help Index Format |
| HIV file extension | Microsoft | Windows NT Registry Hive |
| HLP file extension | Microsoft | Help Format |
| HPC file extension | Microsoft Corporation | System Dynamic Library |
| HPFS file extension | IBM | OS/2 High Performance File System |
| HPJ file extension | Microsoft | Microsoft Win Help Project Format |
| HSH file extension | Microsoft | Windows Catalog Search Index Format |
| HTT file extension | Microsoft | Microsoft HyperText Template Format |
| HTW file extension | Microsoft Corporation | Windows |
| HV file extension | Microsoft Corporation | Microsoft Windows Mobile Hive |
| HXI file extension | Microsoft Corporation | Microsoft Help Compiled Storage |
| IA64 file extension | Hewlett-Packard Company | HP-UX |
| ICL file extension | Microsoft | Icon Library Format |
| ICNS file extension | Apple | Apple Icon Graphic Format |
| ICO file extension | N/A | Icon Format |
| IDENTIFIER file extension | Microsoft Corporation | Microsoft Windows Zone Identifier |
| IDX file extension | N/A | Index Format |
| IDX_DLL file extension | Microsoft Corporation | Microsoft Office IDX_DLL |
| IFW file extension | PCS Systemtechnik | INTUS Firmware Format |
| IME file extension | Microsoft | Global Input Method Editor |
| IMG3 file extension | Apple | Apple IOS Img3 Encrypted Or Signed Container Format |
| INA file extension | Microsoft Corporation | MS-DOS |
| INF_LOC file extension | Microsoft | Microsoft Windows Installation Format |
| INS file extension | Microsoft | Microsoft IIS Internet Communications Settings Format |
| INSTALL_BACKUP file extension | AVG Technologies (Grisoft) | AVG Shell Extension Module |
| INTERNETCONNECT file extension | Apple | Apple Mac OS X System Preferences Internet Connect Document Format |
| ION file extension | N/A | Description Format |
| IOPLIST file extension | Apple | Apple Mac OS X Ioplist Format |
| IPOD file extension | Rockbox | Rockbox Executable Application |
| IRIX6 file extension | Silicon Graphics, Inc. | Irix 6 |
| ISWP file extension | Apple, Inc. | Apple ITunes IOS Firmware Update |
| ITEMDATA-MS file extension | Microsoft | Windows 8 Start Screen Item Data Format |
| ITS file extension | Microsoft | Internet Document Format |
| IUS file extension | Shanghai InfoTM Microelectronics | InfoTMIC Android Update Format |
| JFS file extension | N/A | Linux/Unix Journaling System |
| JLB file extension | N/A | PAC Mate BX Keyboard Driver |
| JOB file extension | Microsoft | Microsoft Windows Task Scheduler Task Object Format |
| JOURNAL_INFO_BLOCK file extension | Apple, Inc. | Apple Mac OS Xsystem |
| JPN file extension | Microsoft | Windows Japanese Noise-Word List Format |
| K48 file extension | Apple, Inc. | Apple IOS Kernel Cache |
| KBD file extension | N/A | Keyboard Script File Layout |
| KEXT file extension | N/A | Apple Mac OS X Kernel Extension Format |
| KEY file extension | N/A | Licence Or Encrypted Security Format |
| KMD file extension | N/A | Clicker Module Output |
| KO file extension | N/A | Linux Kernel Module Format |
| KOR file extension | Microsoft | Korean Localization Language Format |
| KS file extension | N/A | Kickstart Format |
| KSS file extension | KDE e.V | KDE Screen Saver |
| LE file extension | Apple, Inc. | Le Mac OS X |
| LFS file extension | Samsung | Samsung Test Picture Image Format |
| LGS file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LIBRARY-MS file extension | Microsoft | Microsoft Windows 7 Library Description Format |
| LLS file extension | Microsoft Corporation | Windows System |
| LN file extension | IBM | UNIX Lint |
| LNK file extension | Microsoft | Windows Shortcut Format |
| LOCALIZED file extension | Apple, Inc. | MAC OS X |
| LOCKFILE file extension | Apple | Mac OS X Lion Property List XML Lock Format |
| LOG1 file extension | Microsoft | Microsoft Windows Registry Hive Log Format |
| LOG2 file extension | Microsoft | Microsoft Windows Registry Hive Log 2 Format |
| LPD file extension | National Instruments | Lookout Protocol Driver Format |
| LS_ file extension | The Open Group | Unix Ls Directory |
| MANIFEST file extension | N/A | Windows Visual Styles Format |
| MAPIMAIL file extension | N/A | Windows Send To Mail Recipient Format |
| MBR file extension | N/A | Master Boot Record Format |
| MDIMPORTER file extension | Apple, Inc. | Spotlight Importer Setting |
| MDMP file extension | Microsoft | Microsoft Windows Minidump Format |
| MEM file extension | Parallels | Parallels Virtual Machine Memory Dump Format |
| METADATA_NEVER_INDEX file extension | Apple | Spotlight Never Index Format |
| MI4 file extension | NVIDIA | NVidia PortalPlayer Firmware Update Format |
| MKEXT file extension | Apple, Inc. | Mac OS X Mach Kernel Extension Memory Cache |
| MLC file extension | Microsoft | Microsoft Windows Language Interface Pack Format |
| MOBILECONFIG file extension | Apple | Apple IPhone Mobile Configuration Profile |
| MOJITO file extension | Lime Wire LLC. | Limewire Kademlia |
| MONITORPANEL file extension | Apple, Inc. | Apple Mac OS X Display Panel Extension |
| MPS_ file extension | Joshua Juran | MPW Shell |
| MSC file extension | Microsoft | Microsoft Management Console Control Format |
| MSDM file extension | Microsoft Corporation | Microsoft Windows |
| MSP file extension | Microsoft | Windows Installer Patch Format |
| MSSTYLE file extension | N/A | Windows XP Unsigned Style |
| MSSTYLES file extension | Microsoft | Microsoft Windows Resources Themes Luna Format |
| MUI file extension | Microsoft | MultiLanguage Windows Resource Format |
| MUIMANIFEST file extension | Microsoft Corporation | Microsoft Windows Multilingual User Interface |
| MUI_CCCD5AE0 file extension | Microsoft | Hid User Library |
| MUM file extension | Microsoft | Windows Vista Update Package Format |
| MYDOCS file extension | N/A | Send To Format |
| N81 file extension | Apple, Inc. | Apple IOS Kernel Cache |
| N90 file extension | Apple, Inc. | Apple IOS Kernel Cache |
| N90AP file extension | Apple, Inc. | IPhone Jailbreak Firmware |
| NB0 file extension | N/A | Microsoft Device Emulator Operating System Image Format |
| NBH file extension | N/A | HTC ROM Update Utility ROM Image Format |
| NETWORKCONNECT file extension | Apple | Apple Network Connect Document |
| NFO file extension | Microsoft | Information Readme Text Format |
| NLS file extension | Microsoft | Microsoft National Language Support Format |
| NOS file extension | N/A | JDOS System |
| NOT_TERMINATED file extension | Apple, Inc. | Mac OS X Audit Log |
| NOVS file extension | Novell, Inc. | Novell NetWare Control Center |
| NT file extension | Microsoft | Windows NT Command Script Format |
| NTFS file extension | N/A | NTFS Partition Format |
| NU4 file extension | Symantec Corporation | Norton Utilities DLL Root |
| OS2 file extension | IBM | Os2 System |
| OV1 file extension | Microsoft Corporation | Overlay |
| OV3 file extension | Microsoft Corporation | Overlay |
| OV4 file extension | Microsoft Corporation | Overlay |
| OV5 file extension | Microsoft Corporation | Overlay |
| P5X file extension | Microsoft Corporation | Windows System |
| P7B file extension | N/A | PKCS #7 Certificates Format |
| PANIC file extension | N/A | Kernel Panic Format |
| PAYLOAD file extension | Microsoft Corporation | Microsoft Windows Mobile |
| PCI file extension | Microsoft Corporation | PCI Miniport |
| PCK file extension | Microsoft | Program Package Format |
| PDR file extension | N/A | Windows Port Device Driver Format |
| PFX file extension | N/A | Certificate Format |
| PID file extension | Creative | Creative Driver Format |
| PK2 file extension | Joymax | Silkroad Online Game Data Format |
| PNF file extension | N/A | Microsoft Windows Precompiled Setup Information Format |
| POL file extension | N/A | Windows Policy Format |
| PPD file extension | Adobe Systems | Adobe PageMaker PostScript Printer Description Format |
| PR2 file extension | dataBased Intelligence, Inc. | DBase IV Printer Driver |
| PREFPANE file extension | N/A | Mac OS X System Preference Pane |
| PRF file extension | N/A | Preferences Or Profile Format |
| PRINTEREXPORT file extension | Microsoft | Microsoft Print Migration Format |
| PROFILE file extension | The GNU Project | Bash Shell Profile Format |
| PROVISIONPROFILE file extension | Apple | IOS Provision Profile |
| PRT file extension | N/A | Printer Driver Format |
| PS2 file extension | Microsoft | Microsoft Search Catalog Index Format |
| PWL file extension | Microsoft | Microsoft Windows Password Format |
| PXE file extension | Various Linux developers | Linux, Unix Network Bootable |
| QFILTER file extension | Apple, Inc. | Mac OS X ColorSync Filter |
| QKY file extension | N/A | Linux Quirky Kernel Format |
| QTS file extension | Apple, Inc. | QuickTime System |
| QUICKTIMECOMPONENTS file extension | Apple, Inc. | Mac OS X System |
| QVM file extension | Q | Q Virtual Machine Format |
| RC1 file extension | Samsung | Samsung S5230 Firmware Format |
| RC2 file extension | Samsung | Samsung Mobile Device Firmware Format |
| RCO file extension | Sony | Sony PlayStation Portable PSP Resource Format |
| RDZ file extension | MMIX Mandriva | Mandrake Linux Install |
| REG file extension | Microsoft | Windows Registry Data Format |
| REGTRANS-MS file extension | Microsoft | Microsoft Windows Vista And Windows 7 Registry Format |
| RFW file extension | Fuzhou Rockchip Electronics | Rockchip Firmware Format |
| RGU file extension | Microsoft Corporation | Microsoft Windows Mobile Registry Entry |
| RIO file extension | IBM | IBM AIX System |
| RISCOS file extension | RISCOS Ltd. | Acorn RISC OS |
| RMT file extension | N/A | Linksys Router Firmware Format |
| RS file extension | Microsoft | Windows Rating System Format |
| RSQ file extension | IBM | IBM 4690 Operating System |
| RUF file extension | Samsung | Samsung DVD And Blu-ray Player Firmware Format |
| RWM file extension | Microsoft Corporation | Windows Imaging Resource Only |
| RX file extension | Microsoft Corporation | MS-DOS 7 |
| SAVEDSEARCH file extension | Apple | Spotlight Saved Search |
| SAVER file extension | Apple | Mac OS X Screen Saver |
| SBN file extension | Cisco Systems | Cisco IP Phone Firmware Format |
| SCAP file extension | N/A | EFI Firmware Format |
| SCF file extension | N/A | Windows Explorer Shell Command Format |
| SCHEMAS file extension | The GNOME Project | GConf Schema Definition Format |
| SCR file extension | Microsoft | Microsoft Windows Screensaver Format |
| SDB file extension | Microsoft | |
| SEARCHCONNECTOR-MS file extension | Microsoft | Microsoft Windows Search Connector Description Format |
| SEARCHINDEXCACHE file extension | Apple, Inc. | Mac OS X Cache |
| SERVICE file extension | N/A | Mac OS X Service Application |
| SF0 file extension | Microsoft Corporation | Windows Sytem Check |
| SFCACHE file extension | Microsoft | ReadyBoost Cache Format |
| SHA file extension | The Open Group | Unix SHAR Archive |
| SHD file extension | Microsoft | Microsoft Windows Shadow Spooler Format |
| SHLB file extension | Apple, Inc. | Shlb Mac OS X System |
| SHSH file extension | Apple | Apple IPhone ECID SHSH Format |
| SO0 file extension | N/A | Unix Shared Library Format |
| SPREPORTER file extension | Apple, Inc. | Mac OS X System Profiler Reporter |
| SQM file extension | Microsoft | Microsoft Service Quality Monitoring Format |
| STR file extension | N/A | Screensaver Format |
| SUPPORTED file extension | Apple, Inc. | MAC OS X |
| SWP file extension | N/A | Swap Format |
| SYS file extension | Microsoft | System Format |
| TDZ file extension | Drobo | Drobo Firmware Update Format |
| THA file extension | Microsoft | Windows Thai Noise-Words List Format |
| THEME file extension | Microsoft | Windows Desktop Theme Format |
| TNR file extension | Trimble Navigation Limited | GPS Pathfinder ProXR/XRS Firmware |
| TRX_DLL file extension | Microsoft | Windows Startup Format |
| UAQ file extension | Microsoft Corporation | Microsoft Windows Action Queue |
| UCE file extension | Microsoft | Microsoft Windows XP System32 Format |
| VCN file extension | Vacon Plc | NCDrive Vacon NX System Software |
| VET file extension | CA Technologies | VET Antivirus System |
| VGA file extension | N/A | VGA Display Driver |
| VGD file extension | N/A | Generic CADD VGA Driver |
| VRS file extension | Corel Corporation | Corel WordPerfect Video Resource Device Driver |
| VTD file extension | Microsoft Corporation | Microsoft Windows Custom Virtual Device Driver |
| VXD file extension | N/A | Microsoft Windows Virtual Device Driver |
| VX_ file extension | Microsoft | Compressed Virtual Device Driver Format |
| WDF file extension | Microsoft | Microsoft Windows Driver Foundation Format |
| WDGT file extension | Apple | Apple Mac OS X Dashboard Widget |
| WEBPNP file extension | Microsoft | Web Point And Print Format |
| WER file extension | Microsoft | Microsoft Windows Application Error Report |
| WPH file extension | N/A | Phoenix BIOS Format |
| WPX file extension | N/A | Adobe Printer Description For Postscript Printing Format |
| WRS file extension | Corel Corporation | Corel WordPerfect Windows Printer Driver |
| WSS file extension | Microsoft Corporation | Microsoft Windows Sound System |
| XMO file extension | Adobe Systems Incorporated | Adobe Authorware Movie Driver |
| XMS file extension | Microsoft Corporation | Microsoft EXtended Memory Specification |
| XRM-MS file extension | Microsoft | Microsoft Security Certificate |
| ZEX file extension | ZOOM Corporation | ZOOM MRS-802 System |
| ZONEIDENTIFIER file extension | Microsoft | Windows Zone Identifier Format |
| _DL file extension | Microsoft Corporation | Dynamic Link Library DLL File Form |
| _VTI_BIN file extension | Microsoft Corporation | SharePoint |
Web Developer acting on his own, author of Internet solutions facilitating working with new technologies for less advanced users. Internet maniac.
