| .i | Borland C++ Intermediate Preprocessor Output Format |
| .i00 | Split MDS Disk Image Format |
| .i01 | Split Disk Image Format |
| .i02 | Split Disk Image Format |
| .i03 | Split Disk Image |
| .i04 | Split Disk Image |
| .i05 | Split Disk Image |
| .i17 | Pixel PowerCollage Image |
| .i18 | Pixel Power Collage Image Format |
| .i1c | IBM Voice Type Languages Newuser |
| .i1i | IBM Voice Type Languages Newuser |
| .i2c | IBM Voice Type Languages Newuser |
| .i2d | Wyse Device Management Thin Client Disk Image |
| .i2g | Intergeo I2G Geometric |
| .i2i | IBM Voice Type Languages Newuser |
| .i32 | NI LabView |
| .i3a | Point Blank Game |
| .i3animpack | Point Blank Game |
| .i3c | IBM Voice Type Languages Newuser |
| .i3chr | Point Blank Game |
| .i3d | Houdini Image 3D Format |
| .i3exec | Point Blank |
| .i3i | IBM Voice Type Languages Newuser |
| .i3pack | Point Blank Game Data Format |
| .i3s | Point Blank Game |
| .i5d | IUCLID XML Backup |
| .i5s | IUCLID Compressed Backup |
| .i5z | IUCLID Import Or Export Format |
| .i64 | Interactive Disassembler |
| .ia1 | Infinite Algebra 1 |
| .ia2 | Infinite Algebra Assignment |
| .ia64 | HP-UX |
| .iaa | INTUS Audio Format |
| .iad | Symantec Patch Management |
| .iaf | Microsoft Outlook Exported Account And Email Setting Format |
| .iai | Nova Logic Item Attributes Info |
| .iak | MAIL.DAT Information Access Key |
| .ial | Microsoft SharePoint List Activity |
| .iam | Autodesk Inventor Assembly Format |
| .iao | ImperiumAO Data |
| .iar | CD Katalog |
| .ias | BitDefender Format |
| .ib | InterBase Database Format |
| .ib2 | IncrediBots World Map Format |
| .ib3 | IncrediBots World Map Format |
| .ib7 | Pixel Power Collage Image Format |
| .iba | IBooks Author E-book Format |
| .ibak | Password Safe Backup |
| .ibank | IBank Accounting Data |
| .ibatemplate | IBooks Author Template Format |
| .ibb | LIGHTNING UK! ImgBurn Project Format |
| .ibcd | InstantBingoCard Document Format |
| .ibd | MySQL InnoDB Database Table |
| .ibe | IBECrypto Encrypted |
| .ibf | Final Fantasy XI Game |
| .ibg | IBridge Project Workspace |
| .ibi | Raven Software ICARUS Compiled Script |
| .ibk | Sound Blaster FM Instrument Bank |
| .ibl | IBasic Component Language |
| .ibm | Commodore Amiga Graphics |
| .ibn | WinIQSIM |
| .ibooks | IBooks E-book Format |
| .ibp | IsoBuster Managed Image Information Format |
| .ibplugin | Interface Builder Extension |
| .ibq | IsoBuster Managed Image Format |
| .ibro | IncrediBots Robot Format |
| .ibs | I2 IBase |
| .ibt | Thief Deadly Shadows Texture And Model Format |
| .ibv | IGOR Pro Binary Variable |
| .ibw | IGOR Pro Binary Wave |
| .ibx | Interscope BlackBox |
| .iby | Symbian ROM Image Component Include |
| .ibz | MySQL InnoDB Database Table Compressed Backup |
| .ic | ASwin Project |
| .ic0 | HSPICE Output |
| .ic1 | Atari Bitmap Image Format |
| .ic2 | Atari Bitmap Image Format |
| .ic3 | Atari Bitmap Image Format |
| .ic3d | IC3D Scene Format |
| .ic4 | SADiE Interchange Data |
| .ic5 | Interactive Image Creator Image Project |
| .ic8 | Neo Geo BIOS |
| .ica | Citrix Independent Computer Architecture Format |
| .ical | ICalendar Calendar File Format (Microsoft Outlook, Apple ICal) |
| .icalendar | ICalendar Calendar File Format (Microsoft Outlook, Apple ICal) |
| .icalevent | Apple ICal Document Format |
| .icaltodo | Apple ICal Document Format |
| .icap | Adobe InDesign Format |
| .icb | Truevision Targa Format |
| .icbu | Apple ICal Calendars Backup Format |
| .icc | International Color Consortium Profile File Format |
| .icd | Microsoft Windows OpenGL Installable Client Driver Format |
| .ice | IceChat IRC Client Script Format |
| .icf | Zoom Router Configuration Format |
| .icg | Image Comparer Result |
| .ichat | Apple IChat Saved History Format |
| .ichattransfer | Apple IChat Transfer |
| .ici | Ampac |
| .icl | Icon Library Format |
| .icm | Windows Image Color Matching Format |
| .icma | Adobe InDesign Format |
| .icml | Adobe InDesign Format |
| .icms | RagTime Extensions |
| .icn | Icon Format |
| .icns | Apple Icon Graphic Format |
| .ico | Icon Format |
| .icoa | IBM Image Object Content Architecture (IOCA) Bitmap Graphics |
| .icon | Icon Image Format |
| .iconbox | IconBox |
| .iconboxicon | IconBox |
| .iconpackage | IconPackager Theme Format |
| .icontainer | Icon Container Library Format |
| .icp | Unix IContact Parameter |
| .icpr | IconUtils Project Format |
| .icq | ICQ Archive |
| .icr | Image Comparer Result |
| .ics | ICalendar Calendar File Format (Microsoft Outlook, Apple ICal) |
| .icst | Adobe InCopy Document Preset |
| .icte | Apple Mac Internet Configuration |
| .icursorfx | ICursor Effect Format |
| .icw | Microsoft Internet Explorer Internet Connection Wizard |
| .icx | Remote Call Profiler Summary View |
| .icxs | ITunes |
| .icz | Lib2Def Output |
| .id | IBM Lotus Notes ID Format |
| .id2 | Microsoft Live Messenger Avatar Format |
| .id3 | IData 3 Data |
| .id31 | Helium Music Manager Id3 Tags Export |
| .id32 | Helium Music Manager Id3 Tags Export |
| .ida | Microsoft IIS Server |
| .idap | Adobe InDesign Format |
| .idata | IData 2 Data |
| .idb | Microsoft Visual Studio Developer Intermediate Debug Format |
| .idb2 | InfoStat Database |
| .idc | Internet Database Connector Document Format |
| .idd | Adobe InDesign For Mac Document |
| .ide | Borland C++ Project Format |
| .idea | Adobe Ideas Vector Drawing Format |
| .idemo | InstantDemo Project |
| .identcache | Delphi Temporary Cache |
| .identifier | Microsoft Windows Zone Identifier |
| .idf | Microsoft Windows 95 MIDI Instrument Definition Format |
| .idg | Majax Settings |
| .idh | OpenCBM |
| .idi | I-DEAS Web Access |
| .idif | Netscape Saved Address Book Identification |
| .idl | Visual Studio Visual C++ Interface Definition Library Format |
| .idlk | Adobe InDesign Lock Format |
| .idll | CodeWarrior DLL |
| .idm | IData Mobile Data |
| .idml | Adobe InDesign Markup Format |
| .idms | Adobe InDesign Format |
| .idp | IBM Personal Communications Interchange Document Profile |
| .idpk | Adobe InDesign Format |
| .idpp | Adobe InDesign Format |
| .idq | Microsoft Internet Explorer Data Query |
| .idrc | Adobe InDesign Resource |
| .ids | Infinity Game Engine |
| .idt | Windows Installer Exported Database Table Format |
| .idv | Autodesk Inventor Design View Tree |
| .idw | AutoDesk Inventor Drawing Format |
| .idx | Index Format |
| .idx0 | RuneScape Cache Index Format |
| .idx255 | RuneScape Cache Index Format |
| .idx_dll | Microsoft Office IDX_DLL |
| .idz | I-DEAS Web Access |
| .ie3 | Internet Explorer 3 |
| .iebarzip | Explorer Bar Icon Pack |
| .iec | Microsoft HTML Converter |
| .iei | Image Eye Thumbnail Cache |
| .iel | ParticleIllusion SE Emitter Library |
| .iem | Informix Error Message |
| .ienv | IData 3 Envelope Template |
| .ies | IESNA Photometric Data Format |
| .iex | The Tuttles Madcap Misadventures |
| .if | IFwin Project Format |
| .if9 | Pixel Power Collage Image |
| .ifaith | IFaith Format |
| .ifb | Oracle Siebel Interface Configuration |
| .ifc | Industry Foundation Classes Format |
| .ifcxml | Industry Foundation Classes XML Format |
| .ifczip | Compessed IFC Format |
| .ifd | Adobe Output Designer Form (Jet Form Design Form) |
| .iff | Autodesk Maya Image Interchange Format |
| .ifl | 3D Studio Max Animation Format List Control Format |
| .iflv | InfoLevin Database |
| .ifm | Brighterion IPrevent Fraud Model |
| .ifn | IGOR Pro Formatted Notebook |
| .ifo | DVD Movie Information File Format |
| .ifp | Grand Theft Auto Animation Format |
| .ifr | Formula One 2001 Game |
| .ifs | InfoSlips Secure Information Package Format |
| .ift | Canon Settings |
| .ifu | All Image Image |
| .ifv | Indeo Video Format |
| .ifw | INTUS Firmware Format |
| .ifx | Rational XDE |
| .ifz | All Image Compressed Image |
| .ig | Instagram JPEG Picture Image |
| .ig2 | IGES CAD |
| .iga | CARIS GIS Corner Georeferencing Coordinate |
| .igb | Google Earth Model |
| .igc | Anime List Builder Input Format |
| .ige | Erdas Imagine Large Raster Spill |
| .iges | Initial Graphics Exchange Specification Format |
| .igg | SuiteProfiler Color Map Format |
| .igi | Indigo Renderer Picture Image |
| .igl | IGOR Game |
| .igm | Indigo Renderer Material Texture Format |
| .igma | INTUS Graphics User Interface Format |
| .ign | Adobe RoboHelp Ignore List Format |
| .igo | Instagram JPEG Picture Image |
| .igp | Igor Player Format |
| .igr | SmartSketch Drawing Design Format |
| .igs | IGES ASCII CAD Format |
| .igt | IGrafx Document Template |
| .igv | Integrative Genomics Viewer |
| .igx | IGrafX FlowCharter Flow Chart Or Process Model Format |
| .igy | Microsoft Excel Web Query |
| .igz | Gzipped Image |
| .iha | GE Historian Archive |
| .ihc | Proficy Historian |
| .ihf | IGOR Pro Help |
| .ihs | Bink Inbound History |
| .ihtml | Inline HyperText Markup Language |
| .ihw | IN-HEH Timeline Workspace Format |
| .ihx | IN-HEH Timeline Database Format |
| .ii | IconWorkshop Extended Information Format |
| .iid | IInstaller Idirectory |
| .iie | SimIIe Emulator |
| .iif | QuickBooks Interchange Format |
| .iii | Know Your Stuff |
| .iil | CleanSweep Installation Log |
| .iim | IOpus Internet Macro Format |
| .iimg | Interleaf Image Format |
| .iip | ThinAnywhere Configuration Format |
| .iiq | Phase One RAW Image Format |
| .iis | PHOTOfunSTUDIO HD Video |
| .iit | Install Creator Settings Format |
| .iix | Trados Translation Memory Index Format |
| .ijs | J Interpretor Script Format |
| .ik | CryENGINE IK Animation Format |
| .ikf | INTUS Keyboard Settings Format |
| .ikmp | SampleTank Preset |
| .iks | Microsoft InkSeine Document |
| .il | Euphoria Shrouded Source Code |
| .il3 | ParticleIllusion 3 Emitter Library |
| .ila | LohnViewer Document |
| .ilabel | IData 3 Template Label |
| .ilb | Scream Tracker Data |
| .ilbm | Interleaved Bitmap Format |
| .ildoc | BroadVision QuickSilver Document Format |
| .ilf | Alim |
| .ilg | MakeIndex Error Log |
| .ilht | Safari Internet Location |
| .ilk | Incremental Linking Format |
| .ill | Illust Logic Puzzle |
| .ilm | Opus Creator Multimedia |
| .ilock | IData |
| .ilp | Gurobi Optimizer Temporary |
| .ils | Internet Security And Acceleration Server Summary |
| .ilx | Interlex Vocabulary |
| .im | SunOS Grey Scale Bitmap |
| .im24 | Bitmap Graphic |
| .im32 | Sun 32bit Raster |
| .im5 | Visilog Image |
| .im7 | DaVis Graphics |
| .im8 | Sun Raster Graphic |
| .ima | Generic Disk Image |
| .ima4 | Apple QuickTime IMA4 Encoded Audio |
| .image | ShrinkWrap Disk Image Format |
| .imap | Merak Mail Server Internet Message Access Protocol |
| .imapmbox | Apple Mail Format |
| .imb | IncredMail Adress Book And Temporary Contacts |
| .imc | LucasArts Game Sound |
| .imd | GIS Image Metadata Format |
| .ime | Global Input Method Editor |
| .imelody | IMelody Mobile Phone Ring-tone Format |
| .imesx | Microsoft Office IME Search Provider Definition |
| .imf | Apogee IMF Audio File Format |
| .img | Floppy Image Image Format |
| .img3 | Apple IOS Img3 Encrypted Or Signed Container Format |
| .imga | Marathon 2 Aleph One Image Format |
| .imgb | Final Fantasy XII Model |
| .imgpart | Apple Mac NDIF Split Image |
| .imh | IncrediMail Contacts Export |
| .imi | Magellan Map Format |
| .imj | Pegasus Image Corp Format Bitmap Graphics Format |
| .imk | IncrediMail Licence |
| .iml | ACT! Internet Mail Message Format |
| .imm | IncrediMail Deleted Email Messages List |
| .immodules | GTK+ Module Format |
| .imn | IncrediMail Notify |
| .imo | IMON Manager Settings |
| .imotion | IClone Motion Capture |
| .imovieevent | IMovie Library |
| .imovielibrary | IMovie Event Library |
| .imoviemobile | IMovie Project Package |
| .imovieproj | Apple IMovie Project Format |
| .imovieproject | Apple IMovie Project Format |
| .imp | FileMaker Pro Import Data Filter |
| .imported | UTorrent Torrent |
| .imr | IBM Cognos Impromptu Report Format |
| .ims | IconForge Create Executable Library Data |
| .imscc | Canvas Exported Course |
| .imsp | Survey Designer Survey |
| .imt | IMNET Graphics Image Format |
| .imtx | IMindMap Template |
| .imv | ImageMixerVCD Project |
| .imw | IncrediMail Sound |
| .imx | DaVis Image |
| .imy | IMelody Mobile Phone Ring-tone Format |
| .imz | WinImage Compressed Disk Image |
| .in | McAfee Antivirus Format |
| .in3 | Harvard Graphics Input Device Driver |
| .in4 | InfoBlaster IN4 Registry |
| .in7 | Ox Data |
| .ina | MS-DOS |
| .inb | Rebel Assault Backup |
| .inc | HTML Server Side Include Format |
| .inca | Adobe InDesign Format |
| .incd | Adobe InDesign Format |
| .incp | Adobe InCopy CS3 Package Format |
| .inct | Adobe InCopy Template Format |
| .incx | Adobe InDesign Format |
| .ind | Adobe InDesign Graphics Document Format |
| .indb | Adobe InDesign Book Format |
| .indd | Adobe InDesign Document Format |
| .indesignplugin | Adobe InDesign Plugin Format |
| .index | Eclipse Help Index |
| .indexArrays | Mac OS X Spotlight |
| .indexCompactDirectory | Mac OS X Spotlight |
| .indexDirectory | Mac OS X Spotlight |
| .indexPositions | Mac OS X Spotlight |
| .indexPositionTable | Mac OS X Spotlight |
| .indk | Adobe InDesign Format |
| .indl | Adobe InDesign Object Library Format |
| .indn | Adobe InDesign For Mac |
| .indp | Adobe InDesign Package Format |
| .inds | Adobe InDesign Format |
| .indt | Adobe InDesign Template Format |
| .indx | Microsoft Mail Index |
| .inetloc | Apple Mac OS X Finder Internet Location Format |
| .inf | Windows Installation Script Format |
| .info | ZoomBrowser Image Index Format |
| .info-1 | Cygwin Info |
| .info-10 | Cygwin Info |
| .info-11 | Cygwin Info |
| .info-12 | Cygwin Info |
| .info-13 | Cygwin Info |
| .info-14 | Cygwin Info |
| .info-15 | Cygwin Info |
| .info-16 | Cygwin Info |
| .info-17 | Cygwin Info |
| .info-18 | Cygwin Info |
| .info-19 | Cygwin Info |
| .info-2 | Cygwin Info |
| .info-20 | Cygwin Info |
| .info-21 | Cygwin Info |
| .info-22 | Cygwin Info |
| .info-23 | Cygwin Info |
| .info-24 | Cygwin Info |
| .info-25 | Cygwin Info |
| .info-26 | Cygwin Info |
| .info-27 | Cygwin Info |
| .info-28 | Cygwin Info |
| .info-29 | Cygwin Info |
| .info-3 | Cygwin Info |
| .info-30 | Cygwin Info |
| .info-4 | Cygwin Info |
| .info-5 | Cygwin Info |
| .info-6 | Cygwin Info |
| .info-7 | Cygwin Info |
| .info-8 | Cygwin Info |
| .info-9 | Cygwin Info |
| .infopathxml | Microsoft InfoPath Form Format |
| .inf_loc | Microsoft Windows Installation Format |
| .ing | MasterCook Ingredients Format |
| .ingr | Intergraph Raster File Format |
| .inh | Microsoft Visual Basic Basfwin |
| .ini | Text Configuration Format |
| .ini-dist | PHP INI |
| .ini-recommended | PHP INI |
| .ini2 | Text Configuration |
| .init | WM Keeper CLASSIC Temporary Keys |
| .inix | Adobe InDesign |
| .injb | Adobe InDesign |
| .ink | Mimio Ink Data Format |
| .inl | Microsoft Visual C++ Inline Function Format |
| .inlk | Adobe InDesign Lock Format |
| .inm | FaxMaster Document |
| .inms | Adobe InDesign Menu Set Format |
| .inn | Phantasmagoria Ini |
| .ino | Inno Setup Script Format |
| .inp | Abaqus Input Format |
| .inprogress | Apple Mac OS X Time Machine Temporary Format |
| .inputplugin | Apple Mac OS X PluginIM Input Method |
| .inpx | PTV Vissim Network |
| .inrs | Adobe InDesign For Mac |
| .ins | InstallShield Script Format |
| .insaniquariumdeluxesavedgame | Insaniquarium Deluxe Save Game |
| .insp | Microsoft Visual Studio Inspector |
| .inss | Apple Mac OS X Setup Assistant ISP Info Document |
| .inst | RMCProfile Peak Profile |
| .installhelper | Apple Mac OS X Install Helper Document |
| .installlog | Microsoft .NET Installation Log |
| .install_backup | AVG Shell Extension Module |
| .insx | InScribe XML Document |
| .int | SGI Integer Image |
| .int? | Quicken For Mac |
| .intaglio | Intaglio Drawing |
| .internetconnect | Apple Mac OS X System Preferences Internet Connect Document Format |
| .intu | Quicken For Mac |
| .inuse | Text Configuration File (in Use) |
| .inv | Minecraft INVedit Format |
| .inventor | SGI Open Inventor |
| .inx | Adobe InDesign Interchange File Format |
| .in_ | Microcoft Setup Information |
| .io | CPIO Compressed File Archive |
| .iobit | Advanced SystemCare PRO Backup Format |
| .ioc | Winamp Io Extension |
| .ioca | IBM Image Object Content Architecture (IOCA) Bitmap Graphics |
| .iok | Omniscope Configuration |
| .ion | Description Format |
| .ioplist | Apple Mac OS X Ioplist Format |
| .ior | Maxwell Render Index Of Refraction |
| .ip | IconPackager Theme Format |
| .ip3 | ParticleIllusion Project |
| .ipa | IPhone Application |
| .ipalias | Apple IPhoto Alias Format |
| .ipb | IPhone Perl Script |
| .ipc | IncrediFlash Tools Image |
| .ipcc | Apple IOS Carrier Update Format |
| .ipch | Microsoft Visual C++ Intellisense Precompiled Header Format |
| .ipd | BlackBerry Backup (pre 2012) Format |
| .ipdb | IP Address Tracker IP Database |
| .ipf | Microsoft SMS Installer Script |
| .ipg | IPod Game Package Format |
| .iph | InterPaint (Hires) Image Format |
| .iphoto | Apple IPhoto Library Format |
| .iphotoproject | Apple IPhoto Printing Project |
| .ipi | Microsoft Windows Installer |
| .ipick | IPick Football Picture Image Format |
| .ipj | AutoDesk Inventor Project Format |
| .ipk | Shana Informed Filler Format |
| .ipkg | Indicore SDK Package |
| .ipl | CorelDRAW Pantone Spot Reference Palette Format |
| .ipl22 | PLATO Learning Network Temporary |
| .iplb | Apple IPhoto Library Archive |
| .ipmeta | Apple IPhoto Library Metadata Format |
| .ipn | AutoDesk Inventor Presentation File Format |
| .ipo | InstallShield Object Project |
| .ipod | Rockbox Executable Application |
| .ipp | Inline Guard Macro Format |
| .ipproj | Microsoft Visual Studio InfoPath Project |
| .ipr | IntelliJ Project XML Data Format |
| .iproject | IClone Project Format |
| .ips | International Patching System Binary Patch Format |
| .ipspot | Apple IPhoto Index Format |
| .ipsw | IPhone, IPad Or IPod Touch Software Firmware Update Format |
| .ipt | AutoDesk Inventor Part Format |
| .iptheme | IconPackager Theme Format |
| .iputils | Gnome Desktop |
| .ipx | Ipix Spherical Panorama Format |
| .ipz | ICQ Plus Skin |
| .iqc | CADIQ Comparison Analysis Result |
| .iqd | Impromptu Defintion |
| .iqf | Integra Query |
| .iqp | 20-20 Office Sales Exported Quote |
| .iqr | Cadiq View Analysis Results Data |
| .iqs | CADIQ Summary Log |
| .iqt | Tektronix |
| .iqu | AmeriCalc Update |
| .iqy | Microsoft Excel Internet Query Format |
| .iraf | IRAF |
| .irafhosts | IRAF User |
| .irbrc | Ruby |
| .irc | JIRCii Script |
| .ircp | Adobe SpeedGrade Project Format |
| .ird | Microsoft Money Temporary |
| .irev | Runtime Revolution Script |
| .irf | Autodesk Impression Drawing Format |
| .irg | Sofya Database Interclass Relation Graph |
| .iris | Silicon Irix Graphics Raw Format |
| .irix6 | Irix 6 |
| .irix64biT | Irix 64 Bit Make |
| .irl | IBM WebSphere ILOG JRules Rule Language |
| .irobo | RoboMind Source Code |
| .irock | IntelliRock Sensor Data Format |
| .iros | Adobe Save For Web Settings Format |
| .irp | Microsoft ISA Server Report Generator Output Format |
| .irr | UVBrewer Brewer Lamp Format |
| .irrmesh | Irrlicht Static Mesh |
| .irs | Adobe Photoshop Optimized Setting Format |
| .irv | XMap Workfile |
| .irx | UVBrewer Brewer Lamp Irradiation Format |
| .is | InStereo Audio |
| .is1 | SmartWare Input Screen Format |
| .is2 | SmartWare Input Screen |
| .is3 | SmartWare Input Screen |
| .is4 | SmartWare Input Screen |
| .isa | Adobe Photoshop ImageReady Action |
| .isale | ISale Auction |
| .isaletemplate | ISale Template |
| .isallic | ISale License |
| .isb | Vanguard Music |
| .isc | Xilinx Device Configuration Information Format |
| .iscorrupt | Skype |
| .isd | InstallShield Dialog Format |
| .ise | InstallShield Express Project Format |
| .isf | Inspiration Diagram Format |
| .isff | Intergraph Standard File Format |
| .ish | ISH Compressed Archive |
| .ish1 | Animation-ish Wiggledoodle-ish Document Format |
| .ish2 | Animation-ishFlipBook-ish Document Format |
| .ish3 | Animation-ish Advanced-ish Document Format |
| .isl | InstallShield Temporary Installer |
| .ism | InstallShield Project Format |
| .isma | IIS Smooth Streaming Audio Format |
| .ismc | Smooth Streaming Client Manifest Format |
| .ismclip | IStopMotion Animation Clip |
| .ismv | Smooth Streaming Fragmented MPEG-4 Video Format |
| .isn | InstallShield Installer Source Format |
| .iso | CD/DVD/HD DVD/Blu-ray Disc ISO Binary Image Format |
| .isoz | Arbortext IsoDraw Compressed Drawing Format |
| .isp | Internet Service Provider Settings Format |
| .ispc | Image Surfer Pro Album Format |
| .isq | MicroCT Image |
| .isr | InstallShield Uninstall Information Format |
| .iss | ISS Picture Image Format |
| .ist | Adobe ImageStyler Format |
| .istg | ISOE Imagine Stage |
| .isu | InstallShield Uninstall Script Format |
| .isv | IDL ITools State |
| .iswp | Apple ITunes IOS Firmware Update |
| .isx | Intrasis Object |
| .isym | ArchiCAD For MAC Geometric Description Language |
| .isz | UltraISO Compressed Disk Image Format |
| .it | Impulse Tracker Music Module Format |
| .ita | IconTweaker Theme Archive |
| .itb | ITunes Library Extras |
| .itc | ITunes Cover Flow Data Format |
| .itc2 | Apple ITunes Cover Flow Data Format |
| .itcl | Cygwin Iwidgets Scripts |
| .itd | SDL Trados Translation |
| .itdb | Apple ITunes Database Format |
| .ite | Apple ITunes Extras Format |
| .itemdata-ms | Windows 8 Start Screen Item Data Format |
| .itg | Intergraph Format Bitmap Graphics |
| .ithmb | Apple IPhone, IPad, IPod Thumbnail Image Format |
| .iti | Impulse Tracker Instrument |
| .itk | ScummVM Game Data Format |
| .itl | Apple ITunes Music Database Format |
| .itlp | Apple ITunes LP Format |
| .itls | Apple ITunes Live Stream Format |
| .itm | IThink Model Format |
| .itms | Apple ITunes Store URL Format |
| .itmsp | Apple ITunes Store Package Format |
| .itmz | IThoughtsHD Mind-map Document |
| .itn | TomTom Navigator Itinerary Format |
| .itp | BioWare Aurora Game Engine Palette |
| .itpc | Apple ITunes Podcast Subscription Format |
| .itq | SAIA S-Web Variable Initialization |
| .itr | Icy Tower Format |
| .its | Impulse Tracker Sample Format |
| .itt | IconTweaker Theme Format |
| .itw | InTouch With Database Format |
| .itx | IBM FileNet EForms ITX Form Template Format |
| .itxib | Apple ITunes Dump |
| .itz | Impulse Tracker Music Module |
| .iup | ChessBase Fritz Update Format |
| .ius | InfoTMIC Android Update Format |
| .iv | SGI Inventor VRML Format |
| .iv2i | Norton Ghost Disk Drive Image |
| .iva | Surveillance Video Format |
| .ivb | Truevision Targa Format Bitmap Graphics |
| .ivc | IView MediaPro Catalogue Format |
| .ivd | Bitdefender Incremental Virus Definitions Format |
| .ive | OpenSceneGraph Format |
| .ivex | Worldviz Vizard Encrypted |
| .ivf | Indeo Video Format |
| .ivi | MSDN InfoViewer Topic |
| .ivl | IBM ILOG JViews Maps Map |
| .ivm | Interactive Visual Media Video Format |
| .ivp | Panorama |
| .ivr | Virtual Reality World (iSeeMedia Image World) |
| .ivs | Internet Streaming Video |
| .ivt | Beyond 20/20 Table Aggregate Data Format |
| .ivu | ImmerVision XML User Interface |
| .ivue | Live Picture Image Format |
| .ivwr | IntelliView Offline Report |
| .ivx | Beyond 20/20 Microdata Directory |
| .iw | Chain Engineering Database Format |
| .iw4 | DjVu Image Format |
| .iw44 | DjVu Image Format |
| .iwb | Common File Format |
| .iwc | Installwatch Database |
| .iwd | Call Of Duty Game Archive Format |
| .iwdgt | Apple IWeb Widget Format |
| .iwi | Infinity Ward Texture Format |
| .iwl | WebSite X5 License |
| .iwm | IWriteMusic |
| .iwp | InfinityQS ESPC |
| .iwprj | Website X5 Project |
| .iws | Trojan-Downloader.JS.Agent Format |
| .iwt | Sunnysoft InterWrite Full Keyboard Skin |
| .iwxdata | IWorx Data Format |
| .iwz | InstallShield Express Project Format |
| .iwzip | Website X5 Project |
| .ix | DtSearch Index Format |
| .ix2 | Rebel Chess Program Database Format |
| .ix3 | Instant.Exe 3.0 Script |
| .ix4 | Rebel Chess |
| .ixa | Ulead Disc Image Format |
| .ixb | Ulead Disk Image Format |
| .ixc | ArcView Geocoding Index For Read-write Coverages |
| .ixf | Integration Exchange Format |
| .ixi | IxiQuarks Preferences |
| .ixl | DB/TextWorks Database Indexed List |
| .ixs | ArcView Geocoding Index For Read-write Shape |
| .ixw | ERDAS IMAGINE Toolbar Setting |
| .izd | Intrexx Application Export Format |
| .ize | IZArc Encrypted Archive Format |
| .izs | 1st Page 2000 JavaScript Example |
| .izz | Isadora Media Control Project Format |
| .izzy | Isadora Project Format |
