| .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 |
File extensions are not normally displayed to users. To change this, go to Control Panel, select Appearance and Personalization and Folder Options. Next, select the View and find the option "Hide extensions for known file types". The option should be deselected (cleared) and confirmed with OK.
