| File extension | Developer/Producer | File description |
|---|---|---|
| I file extension | Microsoft | Borland C++ Intermediate Preprocessor Output Format |
| I00 file extension | DVD Shrink | Split MDS Disk Image Format |
| I01 file extension | DVD Shrink | Split Disk Image Format |
| I02 file extension | DVD Shrink | Split Disk Image Format |
| I03 file extension | N/A | Split Disk Image |
| I04 file extension | Freeware | Split Disk Image |
| I05 file extension | N/A | Split Disk Image |
| I17 file extension | N/A | Pixel PowerCollage Image |
| I18 file extension | N/A | Pixel Power Collage Image Format |
| 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 |
| I2D file extension | Wyse Technology Inc. | Wyse Device Management Thin Client Disk Image |
| I2G file extension | N/A | Intergeo I2G Geometric |
| I2I file extension | IBM | IBM Voice Type Languages Newuser |
| I32 file extension | National Instruments Corporation | NI LabView |
| I3A file extension | Zepetto Co. | Point Blank Game |
| I3ANIMPACK file extension | Zepetto Co. | Point Blank Game |
| I3C file extension | IBM | IBM Voice Type Languages Newuser |
| I3CHR file extension | Zepetto Co. | Point Blank Game |
| I3D file extension | Side Effects | Houdini Image 3D Format |
| I3EXEC file extension | Zepetto Co. | Point Blank |
| I3I file extension | IBM | IBM Voice Type Languages Newuser |
| I3PACK file extension | Zepetto | Point Blank Game Data Format |
| I3S file extension | Zepetto Co. | Point Blank Game |
| I5D file extension | European Commission | IUCLID XML Backup |
| I5S file extension | European Commission | IUCLID Compressed Backup |
| I5Z file extension | IUCLID | IUCLID Import Or Export Format |
| 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 |
| IA64 file extension | Hewlett-Packard Company | HP-UX |
| IAA file extension | PCS Systemtechnik | INTUS Audio Format |
| IAD file extension | Symantec Corporation | Symantec Patch Management |
| IAF file extension | Microsoft | Microsoft Outlook Exported Account And Email Setting Format |
| IAI file extension | N/A | Nova Logic Item Attributes Info |
| IAK file extension | IDEAlliance | MAIL.DAT Information Access Key |
| IAL file extension | Microsoft Corporation | Microsoft SharePoint List Activity |
| IAM file extension | Autodesk | Autodesk Inventor Assembly Format |
| IAO file extension | ImperiumGames | ImperiumAO Data |
| IAR file extension | Krzysztof Wojtas | CD Katalog |
| IAS file extension | Professional Wireless | Intermodulation Analysis System Format |
| IB file extension | N/A | InterBase Database Format |
| IB2 file extension | IncrediBots | IncrediBots World Map Format |
| IB3 file extension | IncrediBots | IncrediBots World Map Format |
| IB7 file extension | N/A | Pixel Power Collage Image Format |
| IBA file extension | Apple | IBooks Author E-book Format |
| IBAK file extension | SourceForge.net | Password Safe Backup |
| IBANK file extension | IGG Software, LLC | IBank Accounting Data |
| IBATEMPLATE file extension | Apple | IBooks Author Template Format |
| IBB file extension | Lightning UK! | LIGHTNING UK! ImgBurn Project Format |
| IBCD file extension | InstantBingoCard.com | InstantBingoCard Document Format |
| IBD file extension | Oracle Corporation | MySQL InnoDB Database Table |
| IBE file extension | IBECrypto Team | IBECrypto Encrypted |
| IBF file extension | Square Enix, Inc. | Final Fantasy XI Game |
| IBG file extension | i2 | IBridge Project Workspace |
| IBI file extension | Raven Software | Raven Software ICARUS Compiled Script |
| IBK file extension | N/A | Sound Blaster FM Instrument Bank |
| IBL file extension | Pyxia Development | IBasic Component Language |
| IBM file extension | N/A | Commodore Amiga Graphics |
| IBN file extension | Rohde & Schwarz | WinIQSIM |
| IBOOKS file extension | Apple | IBooks E-book Format |
| IBP file extension | Smart Projects | IsoBuster Managed Image Information Format |
| IBPLUGIN file extension | Apple | Interface Builder Extension |
| IBQ file extension | Smart Projects | IsoBuster Managed Image Format |
| IBRO file extension | IncrediBots | IncrediBots Robot Format |
| IBS file extension | i2 Limited | I2 IBase |
| IBT file extension | Eidos | Thief Deadly Shadows Texture And Model Format |
| 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 |
| IBZ file extension | Oracle Corporation | MySQL InnoDB Database Table Compressed Backup |
| IC file extension | National Instruments Corporation | SPICE Initial Condition |
| IC0 file extension | Synopsys, Inc. | HSPICE Output |
| IC1 file extension | Atari | Atari Bitmap Image Format |
| IC2 file extension | Atari | Atari Bitmap Image Format |
| IC3 file extension | Atari | Atari Bitmap Image Format |
| IC3D file extension | IronCAD | IC3D Scene Format |
| IC4 file extension | Prism Media Products Limited | SADiE Interchange Data |
| IC5 file extension | WebUnion Media Ltd. | Interactive Image Creator Image Project |
| IC8 file extension | N/A | Neo Geo BIOS |
| ICA file extension | Citrix | Citrix Independent Computer Architecture Format |
| ICAL file extension | N/A | ICalendar Format |
| ICALENDAR file extension | N/A | ICalendar Format |
| ICALEVENT file extension | Apple | Apple ICal Document Format |
| ICALTODO file extension | Apple | Apple ICal Document Format |
| ICAP file extension | Adobe Systems | Adobe InDesign Format |
| ICB file extension | Avid Technology | Truevision Targa Format |
| ICBU file extension | Apple | Apple ICal Calendars Backup Format |
| ICC file extension | N/A | International Color Consortium Profile File Format |
| ICD file extension | Microsoft | Microsoft Windows OpenGL Installable Client Driver Format |
| ICE file extension | N/A | IceChat IRC Client Script Format |
| ICF file extension | Zoom Telephonics | Zoom Router Configuration Format |
| ICG file extension | Bolide Software | Image Comparer Results Format |
| ICHAT file extension | Apple | Apple IChat Saved History Format |
| ICHATTRANSFER file extension | Apple, Inc. | Apple IChat Transfer |
| ICI file extension | Semichem, Inc. | Ampac |
| ICL file extension | Microsoft | Icon Library Format |
| ICM file extension | N/A | Windows Image Color Matching Format |
| ICMA file extension | Adobe Systems | Adobe InDesign Format |
| ICML file extension | Adobe Systems | Adobe InDesign Format |
| ICMS file extension | RagTime GmbH | RagTime Extensions |
| ICN file extension | N/A | Icon Format |
| ICNS file extension | Apple | Apple Icon Graphic Format |
| ICO file extension | N/A | Icon Format |
| ICOA file extension | N/A | IBM Image Object Content Architecture (IOCA) Bitmap Graphics |
| ICON file extension | N/A | Icon Image Format |
| ICONBOX file extension | ChickenByte | IconBox |
| ICONBOXICON file extension | ChickenByte | IconBox |
| ICONPACKAGE file extension | Stardock | IconPackager Theme Format |
| ICONTAINER file extension | Panic | Icon Container Library Format |
| ICP file extension | N/A | Unix IContact Parameter |
| ICPR file extension | Aha-Soft | IconUtils Project Format |
| ICQ file extension | ICQ LLC | ICQ Archive |
| ICR file extension | Bolide Software | Image Comparer Result |
| ICS file extension | N/A | ICalendar Calendar File Format (Microsoft Outlook, Apple ICal) |
| ICST file extension | Adobe Systems Incorporated | Adobe InCopy Document Preset |
| ICTE file extension | Apple, Inc. | Apple Mac Internet Configuration |
| ICURSORFX file extension | GioFX | ICursor Effect Format |
| ICW file extension | Microsoft Corporation | Microsoft Internet Explorer Internet Connection Wizard |
| 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 |
| ID2 file extension | Microsoft | Microsoft Live Messenger Avatar Format |
| ID3 file extension | Michal L. Wright | IData 3 Data |
| ID31 file extension | Intermedia Software | Helium Music Manager Id3 Tags Export |
| ID32 file extension | Intermedia Software | Helium Music Manager Id3 Tags Export |
| IDA file extension | Microsoft Corporation | Microsoft IIS Server |
| IDAP file extension | Adobe Systems | Adobe InDesign Format |
| IDATA file extension | Michal L. Wright | IData 2 Data |
| IDB file extension | Microsoft | Microsoft Visual Studio Developer Intermediate Debug Format |
| IDB2 file extension | N/A | InfoStat Database |
| IDC file extension | Microsoft | Internet Database Connector Document Format |
| IDD file extension | N/A | Adobe InDesign For Mac Document |
| IDE file extension | Autodesk | Inventor IFeature Format |
| IDEA file extension | Adobe Systems | Adobe Ideas Vector Drawing Format |
| IDEMO file extension | NetPlay Software | InstantDemo Project |
| IDENTCACHE file extension | Embarcadero Technologies, Inc. | Delphi Temporary Cache |
| IDENTIFIER file extension | Microsoft Corporation | Microsoft Windows Zone Identifier |
| IDF file extension | N/A | Microsoft Windows 95 MIDI Instrument Definition Format |
| IDG file extension | aaton s.a. | Majax Settings |
| 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 |
| IDL file extension | Microsoft | Visual Studio Visual C++ Interface Definition Library Format |
| 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 |
| IDML file extension | Adobe Systems | Adobe InDesign Markup Format |
| IDMS file extension | Adobe Systems | Adobe InDesign Format |
| IDP file extension | IBM | IBM Personal Communications Interchange Document Profile |
| IDPK file extension | Adobe Systems | Adobe InDesign Format |
| IDPP file extension | Adobe Systems | Adobe InDesign Format |
| IDQ file extension | Microsoft Corporation | Microsoft Internet Explorer Data Query |
| IDRC file extension | Adobe Systems Incorporated | Adobe InDesign Resource |
| IDS file extension | BioWare | Infinity Game Engine |
| IDT file extension | Microsoft | Windows Installer Exported Database Table Format |
| IDV file extension | Autodesk | Autodesk Inventor Design View Tree |
| IDW file extension | Autodesk | AutoDesk Inventor Drawing Format |
| IDX file extension | N/A | Index Format |
| IDX0 file extension | Jagex | RuneScape Cache Index Format |
| IDX255 file extension | Jagex | RuneScape Cache Index Format |
| IDX_DLL file extension | Microsoft Corporation | Microsoft Office IDX_DLL |
| IDZ file extension | Siemens Product Lifecycle Management Software Inc. | I-DEAS Web Access |
| IE3 file extension | Microsoft Corporation | Internet Explorer 3 |
| IEBARZIP file extension | N/A | Explorer Bar Icon Pack |
| 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 |
| IEM file extension | IBM | Informix Error Message |
| IENV file extension | Michal L. Wright | IData 3 Envelope Template |
| IES file extension | Illuminating Engineering Society | IESNA Photometric Data Format |
| IEX file extension | Leagacy Interactive | The Tuttles Madcap Misadventures |
| IF file extension | Procedimientos-Uno | IFwin Project Format |
| IF9 file extension | N/A | Pixel Power Collage Image |
| IFAITH file extension | iH8sn0w | IFaith Format |
| IFB file extension | Oracle Corporation | Oracle Siebel Interface Configuration |
| IFC file extension | BuildingSMART | Industry Foundation Classes Format |
| IFCXML file extension | N/A | Industry Foundation Classes XML Format |
| IFCZIP file extension | N/A | Compessed IFC Format |
| IFD file extension | Fly Software | Adobe Output Designer Form (Jet Form Design Form) |
| IFF file extension | Electronic Arts | Autodesk Maya Image Interchange Format |
| IFL file extension | Autodesk | 3D Studio Max Animation Format List Control Format |
| IFLV file extension | InfoLevin Software | InfoLevin Database |
| IFM file extension | Brighterion | Brighterion IPrevent Fraud Model |
| IFN file extension | N/A | IGOR Pro Formatted Notebook |
| IFO file extension | N/A | DVD Movie Information File Format |
| IFP file extension | Rockstar Games | Grand Theft Auto Animation Format |
| IFR file extension | Sony Corporation | Formula One 2001 Game |
| IFS file extension | InfoSlips | InfoSlips Secure Information Package Format |
| IFT file extension | N/A | Canon Settings |
| IFU file extension | Towodo Software | All Image Image |
| IFV file extension | N/A | Indeo Video Format |
| IFW file extension | PCS Systemtechnik | INTUS Firmware Format |
| IFX file extension | IBM | Rational XDE |
| IFZ file extension | Towodo Software | All Image Compressed Image |
| IG file extension | Facebook, Inc. | Instagram JPEG Picture Image |
| IG2 file extension | N/A | IGES CAD |
| IGA file extension | CARIS | CARIS GIS Corner Georeferencing Coordinate |
| IGB file extension | Google Inc. | Google Earth Model |
| IGC file extension | IGC | Anime List Builder Input Format |
| IGE file extension | ERDAS, Inc. | Erdas Imagine Large Raster Spill |
| IGES file extension | N/A | Initial Graphics Exchange Specification Format |
| IGG file extension | Dana Foy | SuiteProfiler Color Map Format |
| IGI file extension | Glare Technologies Limited | Indigo Renderer Picture Image |
| IGL file extension | Elmer Productions | IGOR Game |
| IGM file extension | Glare Technologies | Indigo Renderer Material Texture Format |
| IGMA file extension | PCS Systemtechnik | INTUS Graphics User Interface Format |
| IGN file extension | Adobe Systems | Adobe RoboHelp Ignore List Format |
| IGO file extension | Facebook, Inc. | Instagram JPEG Picture Image |
| IGP file extension | NoteHeads | Igor Player Format |
| IGR file extension | Act-3D | Quest3D Channel Group Layout Format |
| IGS file extension | N/A | IGES ASCII CAD Format |
| IGT file extension | iGrafx | IGrafx Document Template |
| IGV file extension | Broad Institute | Integrative Genomics Viewer |
| IGX file extension | iGrafx | IGrafX FlowCharter Flow Chart Or Process Model Format |
| IGY file extension | Microsoft Corporation | Microsoft Excel Web Query |
| IGZ file extension | Jean-loup Gailly | Gzipped Image |
| IHA file extension | General Electric Company | GE Historian Archive |
| 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 |
| IHTML file extension | N/A | Inline HyperText Markup Language |
| IHW file extension | IN-HEH | IN-HEH Timeline Workspace Format |
| IHX file extension | IN-HEH | IN-HEH Timeline Database Format |
| II file extension | Axialis Software | IconWorkshop Extended Information Format |
| IID file extension | i-Installer Team | IInstaller Idirectory |
| IIE file extension | N/A | SimIIe Emulator |
| IIF file extension | Intuit | QuickBooks Interchange Format |
| III file extension | Insurance Information Institute, Inc. | Know Your Stuff |
| IIL file extension | N/A | CleanSweep Installation Log |
| IIM file extension | iOpus | IOpus Internet Macro Format |
| IIMG file extension | N/A | Interleaf Image Format |
| IIP file extension | Mercury International Technology | ThinAnywhere Configuration Format |
| IIQ file extension | Phase One | Phase One RAW Image Format |
| IIS file extension | Panasonic Corporation | PHOTOfunSTUDIO HD Video |
| IIT file extension | Clickteam | Install Creator Settings Format |
| IIX file extension | SDL | Trados Translation Memory Index Format |
| IJS file extension | JSoftware | J Interpretor Script Format |
| IK file extension | Crytek | CryENGINE IK Animation Format |
| IKF file extension | PCS Systemtechnik | INTUS Keyboard Settings Format |
| IKMP file extension | IK Multimedia Production srl | SampleTank Preset |
| IKS file extension | Microsoft Corporation | Microsoft InkSeine Document |
| IL file extension | André Luiz Barbosa | SimuPLC Electric Commands Language Instruction List |
| IL3 file extension | wondertouch, LLC | ParticleIllusion 3 Emitter Library |
| ILA file extension | DATEV | LohnViewer Document |
| ILABEL file extension | Michal L. Wright | IData 3 Template Label |
| ILB file extension | Psi | Scream Tracker Data |
| ILBM file extension | Electronic Arts | Interleaved Bitmap Format |
| ILDOC file extension | BroadVision | BroadVision QuickSilver Document Format |
| ILF file extension | Islamic Goods Direct | Alim |
| ILG file extension | Pehong Chen | MakeIndex Error Log |
| ILHT file extension | Apple, Inc. | Safari Internet Location |
| ILK file extension | Microsoft | Incremental Linking Format |
| ILL file extension | N/A | Illust Logic Puzzle |
| ILM file extension | Digital Workshop | Opus Creator Multimedia |
| 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 |
| IM file extension | Sun Microsystems, Inc. | SunOS Grey Scale Bitmap |
| IM24 file extension | N/A | Bitmap Graphic |
| IM32 file extension | Sun Microsystems, Inc. | Sun 32bit Raster |
| IM5 file extension | N/A | Visilog Image |
| IM7 file extension | LaVision | DaVis Graphics |
| IM8 file extension | Sun Microsystems, Inc. | Sun Raster Graphic |
| IMA file extension | N/A | Generic Disk Image |
| IMA4 file extension | N/A | Apple QuickTime IMA4 Encoded Audio |
| IMAGE file extension | N/A | ShrinkWrap Disk Image Format |
| IMAP file extension | Icewarp Ltd. | Merak Mail Server Internet Message Access Protocol |
| IMAPMBOX file extension | N/A | Apple Mail Format |
| IMB file extension | Perion Network Ltd. | IncredMail Adress Book And Temporary Contacts |
| IMC file extension | LucasArts Entertainment Company, LLC | LucasArts Game Sound |
| IMD file extension | N/A | GIS Image Metadata Format |
| IME file extension | Microsoft | Global Input Method Editor |
| IMELODY file extension | N/A | IMelody Mobile Phone Ring-tone Format |
| IMESX file extension | Microsoft Corporation | Microsoft Office IME Search Provider Definition |
| IMF file extension | id Software | Apogee IMF Audio File Format |
| IMG file extension | Apple | Macintosh Disk Image |
| IMG3 file extension | Apple | Apple IOS Img3 Encrypted Or Signed Container Format |
| IMGA file extension | Bungie Studios | Marathon 2 Aleph One Image Format |
| IMGB file extension | SQUARE ENIX CO. | Final Fantasy XII Model |
| IMGPART file extension | Apple, Inc. | Apple Mac NDIF Split Image |
| IMH file extension | Perion Network Ltd. | IncrediMail Contacts Export |
| IMI file extension | Magellan | Magellan Map Format |
| IMJ file extension | Pegasus Image Corporation | Pegasus Image Corp Format Bitmap Graphics Format |
| IMK file extension | Perion Network Ltd. | IncrediMail Licence |
| IML file extension | JetBrains | IntelliJ IDEA Module Format |
| IMM file extension | Perion Network Ltd. | IncrediMail Deleted Email Messages List |
| IMMODULES file extension | N/A | GTK+ Module Format |
| IMN file extension | Perion Network Ltd. | IncrediMail Notify |
| IMO file extension | SoundGraph, Inc. | IMON Manager Settings |
| IMOTION file extension | Reallusion Inc. | IClone Motion Capture |
| IMOVIEEVENT file extension | Apple, Inc. | IMovie Library |
| IMOVIELIBRARY file extension | Apple, Inc. | IMovie Event Library |
| IMOVIEMOBILE file extension | Apple, Inc. | IMovie Project Package |
| IMOVIEPROJ file extension | Apple | Apple IMovie Project Format |
| IMOVIEPROJECT file extension | Apple | Apple IMovie Project Format |
| IMP file extension | Adobe Systems | Audition Impulse Format |
| IMPORTED file extension | BitTorrent, Inc. | UTorrent Torrent |
| IMR file extension | IBM | IBM Cognos Impromptu Report Format |
| IMS file extension | CursorArts Company | IconForge Create Executable Library Data |
| IMSCC file extension | Instructure | Canvas Exported Course |
| IMSP file extension | iMagic Software | Survey Designer Survey |
| IMT file extension | Intuit | My Time Data Format |
| IMTX file extension | ThinkBuzan | IMindMap Template |
| IMV file extension | Pixela Corporation | ImageMixerVCD Project |
| IMW file extension | Perion Network Ltd. | IncrediMail Sound |
| IMX file extension | LaVision | DaVis Image |
| IMY file extension | N/A | IMelody Mobile Phone Ring-tone Format |
| IMZ file extension | Gilles Vollant | WinImage Compressed Disk Image |
| 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 |
| INA file extension | Microsoft Corporation | MS-DOS |
| INB file extension | LucasArts Entertainment Company, LLC | Rebel Assault Backup |
| INC file extension | N/A | Include Format |
| INCA file extension | Adobe Systems | Adobe InDesign Format |
| INCD file extension | Adobe Systems | Adobe InDesign Format |
| INCP file extension | Adobe Systems | Adobe InCopy CS3 Package Format |
| INCT file extension | Adobe Systems | Adobe InCopy Template Format |
| INCX file extension | Adobe Systems | Adobe InDesign Format |
| IND file extension | Adobe Systems | Adobe InDesign Graphics Document Format |
| INDB file extension | Adobe Systems | Adobe InDesign Book Format |
| INDD file extension | Adobe Systems | Adobe InDesign Document 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 |
| INDL file extension | Adobe Systems | Adobe InDesign Object Library Format |
| INDN file extension | Adobe Systems Incorporated | Adobe Indesign For Mac |
| INDP file extension | Adobe Systems | Adobe InDesign Package Format |
| INDS file extension | Adobe Systems | Adobe InDesign Format |
| INDT file extension | Adobe Systems | Adobe InDesign Template Format |
| INDX file extension | Microsoft Corporation | Microsoft Mail Index |
| INETLOC file extension | N/A | Apple Mac OS X Finder Internet Location Format |
| INF file extension | N/A | Windows Installation Script Format |
| INFO file extension | Canon | ZoomBrowser Image Index 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 |
| INFOPATHXML file extension | Microsoft | Microsoft InfoPath Form Format |
| INF_LOC file extension | Microsoft | Microsoft Windows Installation Format |
| ING file extension | N/A | MasterCook Ingredients Format |
| INGR file extension | Intergraph Corporation | Intergraph Raster File Format |
| INH file extension | Microsoft Corporation | Microsoft Visual Basic Basfwin |
| INI file extension | N/A | Text Configuration Format |
| INI-DIST file extension | The PHP Group | PHP INI |
| INI-RECOMMENDED file extension | The PHP Group | PHP INI |
| INI2 file extension | N/A | Text Configuration |
| 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 |
| INK file extension | Pantone | CorelDRAW Pantone Reference Fills Format |
| INL file extension | Microsoft | Microsoft Visual C++ Inline Function Format |
| INLK file extension | Adobe Systems | Adobe InDesign Lock Format |
| INM file extension | N/A | FaxMaster Document |
| INMS file extension | Adobe Systems | Adobe InDesign Menu Set Format |
| INN file extension | Activision Blizzard, Inc. | Phantasmagoria Ini |
| INO file extension | Arduino | Arduino Sketch Format |
| INP file extension | N/A | Abaqus Input Format |
| INPROGRESS file extension | Apple | Apple Mac OS X Time Machine Temporary Format |
| INPUTPLUGIN file extension | Apple, Inc. | Apple Mac OS X PluginIM Input Method |
| INPX file extension | PTV Group | PTV Vissim Network |
| INRS file extension | Adobe Systems Incorporated | Adobe InDesign For Mac |
| INS file extension | Microsoft | Microsoft IIS Internet Communications Settings Format |
| INSANIQUARIUMDELUXESAVEDGAME file extension | GameHouse, Inc. | Insaniquarium Deluxe Save Game |
| INSP file extension | Microsoft Corporation | Microsoft Visual Studio Inspector |
| INSS file extension | Apple, Inc. | Apple Mac OS X Setup Assistant ISP Info Document |
| 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 |
| INSTALL_BACKUP file extension | AVG Technologies (Grisoft) | AVG Shell Extension Module |
| INSX file extension | Saqqara Technology Ltd. | InScribe XML Document |
| INT file extension | Silicon Graphics | SGI Integer Image |
| INT? file extension | Intuit Inc. | Quicken For Mac |
| INTAGLIO file extension | Purgatory Design | Intaglio Drawing |
| INTERNETCONNECT file extension | Apple | Apple Mac OS X System Preferences Internet Connect Document Format |
| INTU file extension | Intuit Inc. | Quicken For Mac |
| INUSE file extension | N/A | Text Configuration File (in Use) |
| INV file extension | Copyboy | Minecraft INVedit Format |
| INVENTOR file extension | SGI | SGI Open Inventor |
| INX file extension | Adobe Systems | Adobe InDesign Interchange File Format |
| IN_ file extension | Microsoft Corporation | Microcoft Setup Information |
| IO file extension | Various Linux developers | CPIO Compressed File Archive |
| IOBIT file extension | IObit | Advanced SystemCare PRO Backup Format |
| IOC file extension | Nullsoft, Inc. | Winamp Io Extension |
| IOCA file extension | N/A | IBM Image Object Content Architecture (IOCA) Bitmap Graphics |
| IOK file extension | Visokio | Omniscope Configuration |
| ION file extension | N/A | Description Format |
| IOPLIST file extension | Apple | Apple Mac OS X Ioplist Format |
| IOR file extension | Next Limit Technologies | Maxwell Render Index Of Refraction |
| IP file extension | Stardock | IconPackager Icon Set Format |
| IP3 file extension | wondertouch, LLC | ParticleIllusion Project |
| IPA file extension | Apple, Inc. | IPhone Application |
| IPB file extension | N/A | IPhone Perl Script |
| IPC file extension | IncrediTools | IncrediFlash Tools Image |
| IPCC file extension | Apple | Apple IOS Carrier Update Format |
| IPCH file extension | Microsoft | Microsoft Visual C++ Intellisense Precompiled Header Format |
| IPD file extension | Research In Motion | BlackBerry Backup (pre 2012) Format |
| IPDB file extension | SolarWinds | IP Address Tracker IP Database |
| IPF file extension | Microsoft | Microsoft SMS Installer Script |
| IPG file extension | Apple | IPod Game Package Format |
| IPH file extension | N/A | InterPaint (Hires) Image Format |
| IPI file extension | Microsoft Corporation | Microsoft Windows Installer |
| IPICK file extension | iPick Sports | IPick Football Picture Image Format |
| IPJ file extension | Autodesk | AutoDesk Inventor Project Format |
| IPK file extension | N/A | Itsy Package |
| IPKG file extension | Gehtsoft USA, LLC | Indicore SDK Package |
| IPL file extension | Rockstar Games | Grand Theft Auto III Object Placement Data Format |
| IPL22 file extension | PLATO Learning, Inc. | PLATO Learning Network Temporary |
| IPMETA file extension | Apple | Apple IPhoto Library Metadata Format |
| IPN file extension | Autodesk | AutoDesk Inventor Presentation File Format |
| IPO file extension | Flexera Software, Inc. | InstallShield Object Project |
| IPOD file extension | Rockbox | Rockbox Executable Application |
| IPP file extension | N/A | Inline Guard Macro Format |
| IPPROJ file extension | Microsoft Corporation | Microsoft Visual Studio InfoPath Project |
| IPR file extension | Flexera Software | InstallShield Project Format |
| IPROJECT file extension | Reallusion | IClone Project Format |
| IPS file extension | N/A | International Patching System Binary Patch Format |
| IPSW file extension | Apple | IPhone, IPad Or IPod Touch Software Firmware Update Format |
| IPT file extension | Autodesk | AutoDesk Inventor Part Format |
| IPTHEME file extension | Stardock | IconPackager Theme Format |
| IPUTILS file extension | The GNOME Project | Gnome Desktop |
| IPX file extension | Minds-Eye-View | Ipix Spherical Panorama Format |
| IPZ file extension | ICQ LLC | ICQ Plus Skin |
| 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 |
| IQY file extension | Microsoft | Microsoft Excel Internet Query Format |
| IRAF file extension | NOAO | IRAF |
| IRAFHOSTS file extension | NOAO | IRAF User |
| IRBRC file extension | Ruby community | Ruby |
| IRC file extension | Raphaël Mudge | JIRCii Script |
| IRCP file extension | Adobe Systems | Adobe SpeedGrade Project Format |
| IRD file extension | Microsoft Corporation | Microsoft Money Temporary |
| IREV file extension | RunRev Ltd. | Runtime Revolution Script |
| IRF file extension | iVIEW Technology | IVIEW DVR H.264 Video Format |
| IRG file extension | N/A | Sofya Database Interclass Relation Graph |
| IRIS file extension | N/A | Silicon Irix Graphics Raw Format |
| IRIX6 file extension | Silicon Graphics, Inc. | Irix 6 |
| IRIX64BIT file extension | Silicon Graphics, Inc. | Irix 64 Bit Make |
| IRL file extension | IBM | IBM WebSphere ILOG JRules Rule Language |
| IROBO file extension | Arvid Halma | RoboMind Source Code |
| IROCK file extension | Engius | IntelliRock Sensor Data Format |
| IROS file extension | Adobe Systems | Adobe Save For Web Settings Format |
| IRP file extension | Zylox Software | Internet Researcher Project Format |
| IRR file extension | Brewer Data Management Software | UVBrewer Brewer Lamp Format |
| IRRMESH file extension | N/A | Irrlicht Static Mesh |
| IRS file extension | Adobe Systems | Adobe Photoshop Optimized Setting Format |
| IRV file extension | DeLorme | XMap Workfile |
| IRX file extension | Brewer Data Management Software | UVBrewer Brewer Lamp Irradiation Format |
| IS file extension | N/A | InStereo Audio |
| IS1 file extension | M3 Sakura | M3 Sakura Real-Time Save 1 Format |
| IS2 file extension | SmartWare Corporation | SmartWare Input Screen |
| IS3 file extension | SmartWare Corporation | SmartWare Input Screen |
| IS4 file extension | SmartWare Corporation | SmartWare Input Screen |
| ISA file extension | Adobe Systems Incorporated | Adobe Photoshop ImageReady Action |
| ISALE file extension | equinux USA, Inc. | ISale Auction |
| ISALETEMPLATE file extension | equinux USA, Inc. | ISale Template |
| ISALLIC file extension | equinux USA, Inc. | ISale License |
| ISB file extension | Sony Online Entertainment | Vanguard Music |
| ISC file extension | N/A | Xilinx Device Configuration Information Format |
| ISCORRUPT file extension | Skype Limited | Skype |
| ISD file extension | Flexera Software | InstallShield Dialog Format |
| ISE file extension | Flexera Software | InstallShield Express Project Format |
| ISF file extension | Inspiration | Inspiration Diagram Format |
| ISFF file extension | Intergraph Corporation | Intergraph Standard File Format |
| ISH file extension | N/A | ISH Compressed Archive |
| ISH1 file extension | FableVision | Animation-ish Wiggledoodle-ish Document Format |
| ISH2 file extension | FableVision | Animation-ishFlipBook-ish Document Format |
| ISH3 file extension | FableVision | Animation-ish Advanced-ish Document Format |
| ISL file extension | Flexera Software, Inc. | InstallShield Temporary Installer |
| ISM file extension | Flexera Software | InstallShield Project Format |
| ISMA file extension | Microsoft | IIS Smooth Streaming Audio Format |
| ISMC file extension | Microsoft | Smooth Streaming Client Manifest Format |
| ISMCLIP file extension | Boinx Software | IStopMotion Animation Clip |
| ISMV file extension | Microsoft | Smooth Streaming Fragmented MPEG-4 Video Format |
| ISN file extension | N/A | InstallShield Installer Source Format |
| ISO file extension | N/A | CD/DVD/HD DVD/Blu-ray Disc ISO Binary Image Format |
| ISOZ file extension | PTC | Arbortext IsoDraw Compressed Drawing Format |
| ISP file extension | Microsoft | Internet Service Provider Settings Format |
| ISPC file extension | Surfing After Dark | Image Surfer Pro Album Format |
| ISQ file extension | SCANCO Medical | MicroCT Image |
| ISR file extension | N/A | Go-Moku Game Format |
| ISS file extension | Flexera Software | ISS Picture Image Format |
| IST file extension | Flexera Software | InstallShield Project Template Format |
| ISTG file extension | Imagine | ISOE Imagine Stage |
| ISU file extension | Macrovision | InstallShield Uninstall Script Format |
| ISV file extension | Exelis Visual Information Solutions | IDL ITools State |
| ISWP file extension | Apple, Inc. | Apple ITunes IOS Firmware Update |
| ISX file extension | Intrasis | Intrasis Object |
| ISYM file extension | Graphisoft | ArchiCAD For Mac Geometric Description Language |
| ISZ file extension | EZB Systems | UltraISO Compressed Disk Image Format |
| IT file extension | N/A | Impulse Tracker Music Module Format |
| ITA file extension | Joost Verburg | IconTweaker Theme Archive |
| ITB file extension | Apple, Inc. | ITunes Library Extras |
| ITC file extension | Apple | ITunes Cover Flow Data Format |
| ITC2 file extension | Apple | Apple ITunes Cover Flow Data Format |
| ITCL file extension | Red Hat, Inc. | Cygwin Iwidgets Scripts |
| ITD file extension | SDL Tridion | SDL Trados Translation |
| ITDB file extension | Apple | Apple ITunes Database Format |
| ITE file extension | Apple | Apple ITunes Extras Format |
| ITEMDATA-MS file extension | Microsoft | Windows 8 Start Screen Item Data Format |
| ITG file extension | Intergraph Corporation | Intergraph Format Bitmap Graphics |
| ITHMB file extension | Apple | Apple IPhone, IPad, IPod Thumbnail Image Format |
| ITI file extension | N/A | Impulse Tracker Instrument |
| ITK file extension | ScummVM | ScummVM Game Data Format |
| ITL file extension | Apple | Apple ITunes Music Database Format |
| ITLP file extension | Apple | Apple ITunes LP Format |
| ITLS file extension | Apple | Apple ITunes Live Stream Format |
| ITM file extension | isee systems | IThink Model Format |
| ITMS file extension | Apple | Apple ITunes Store URL Format |
| ITMSP file extension | Apple | Apple ITunes Store Package Format |
| ITMZ file extension | Craig Scott | IThoughtsHD Mind-map Document |
| ITN file extension | TomTom International | TomTom Navigator Itinerary Format |
| ITP file extension | BioWare | BioWare Aurora Game Engine Palette |
| ITPC file extension | Apple | Apple ITunes Podcast Subscription Format |
| ITQ file extension | SBC | SAIA S-Web Variable Initialization |
| ITR file extension | Muskedunder Interactive | Icy Tower Format |
| ITS file extension | Microsoft | Internet Document Format |
| ITT file extension | Joost Verburg | IconTweaker Theme Format |
| ITW file extension | Prairie Group | InTouch With Database Format |
| ITX file extension | IBM | IBM FileNet EForms ITX Form Template Format |
| ITXIB file extension | Apple, Inc. | Apple ITunes Dump |
| ITZ file extension | N/A | Impulse Tracker Music Module |
| IUP file extension | ChessBase | ChessBase Fritz Update Format |
| IUS file extension | Shanghai InfoTM Microelectronics | InfoTMIC Android Update Format |
| IV file extension | Visualization Sciences Group | SGI Inventor VRML Format |
| IV2I file extension | Symantec | Norton Ghost Disk Drive Image |
| IVA file extension | N/A | Surveillance Video Format |
| IVB file extension | N/A | Truevision Targa Format Bitmap Graphics |
| IVC file extension | InteliSea | InteliSea Vessel Configuration Format |
| IVD file extension | Bitdefender | Bitdefender Incremental Virus Definitions Format |
| IVE file extension | OSG Community | OpenSceneGraph Format |
| IVEX file extension | Worldviz | Worldviz Vizard Encrypted |
| IVF file extension | Intel | Indeo Video Format |
| IVI file extension | Microsoft Corporation | MSDN InfoViewer Topic |
| IVL file extension | IBM | IBM ILOG JViews Maps Map |
| IVM file extension | N/A | Interactive Visual Media Video Format |
| IVP file extension | Oracle Corporation | Panorama |
| IVR file extension | RealNetworks | RealPlayer Internet Video Recording Format |
| IVS file extension | N/A | Internet Streaming Video |
| IVT file extension | Beyond 20/20 | Beyond 20/20 Table Aggregate Data Format |
| IVU file extension | ImmerVision | ImmerVision XML User Interface |
| IVUE file extension | HSC Software | Live Picture Image Format |
| IVWR file extension | Synaptris, Inc. | IntelliView Offline Report |
| IVX file extension | Beyond 20/20 Inc. | Beyond 20/20 Microdata Directory |
| IW file extension | IWIS | Chain Engineering Database Format |
| IW4 file extension | N/A | DjVu Image Format |
| IW44 file extension | N/A | DjVu Image Format |
| IWB file extension | SMART Technologies ULC | Common File Format |
| IWC file extension | Gavin Stark | Installwatch Database |
| IWD file extension | Activision | Call Of Duty Game Archive Format |
| IWDGT file extension | Apple | Apple IWeb Widget Format |
| IWI file extension | Activision | Infinity Ward Texture Format |
| IWL file extension | Incomedia | WebSite X5 License |
| IWM file extension | Kazuo Nakamura | IWriteMusic |
| IWP file extension | InfnityQS | InfinityQS ESPC |
| IWPRJ file extension | Incomedia | Website X5 Project |
| IWS file extension | N/A | InstallWatch Scan Format |
| IWT file extension | Sunnysoft s.r.o. | Sunnysoft InterWrite Full Keyboard Skin |
| IWXDATA file extension | iWorx Systems | IWorx Data Format |
| IWZ file extension | Flexera Software | InstallShield Express Project Format |
| IWZIP file extension | Incomedia | Website X5 Project |
| IX file extension | dtSearch | DtSearch Index Format |
| IX2 file extension | Corel | Corel WordPerfect Office Address Book Format |
| IX3 file extension | XELERATE Software, Inc | Instant.Exe 3.0 Script |
| IX4 file extension | Lokasoft | Rebel Chess |
| IXA file extension | Corel | Ulead Disc Image Format |
| IXB file extension | Corel | Ulead Disk Image Format |
| IXC file extension | Esri | ArcView Geocoding Index For Read-write Coverages |
| IXF file extension | N/A | Integration Exchange Format |
| IXI file extension | ixi software | IxiQuarks Preferences |
| IXL file extension | Inmagic, Inc. | DB/TextWorks Database Indexed List |
| IXS file extension | Esri | ArcView Geocoding Index For Read-write Shape |
| IXW file extension | ERDAS, Inc. | ERDAS IMAGINE Toolbar Setting |
| IZD file extension | United Planet | Intrexx Application Export Format |
| IZE file extension | IZArc | IZArc Encrypted Archive Format |
| IZS file extension | Evrsoft | 1st Page 2000 JavaScript Example |
| IZZ file extension | TroikaTronix | Isadora Media Control Project Format |
| IZZY file extension | TroikaTronix | Isadora Project Format |
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