Collector: Nosa Lee
Original Address: https://www.seeksunslowly.com/file-extensions-types-references-i
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Now, I collected all the known file extensions/types for your reference, I grouped them according to the first character due to there are too many file extensions/types.

The following file extensions/types are grouped as I*, to refer to more file extensions/types or download them (a compressed txt file that separates the extension and description with ” : “), please click the following links.

A B C D E F G H I J K L M N

O P Q R S T U V W X Y Z
Number  Symbol

Download All File Types/Extensions in ONE Compressed File

I   APLAC Source Code Data File (APLAC)
I   C++ Preprocessor Intermediate File (Borland Software Corporation)
I   INTERCAL File
I   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
I   Phase Vocorder Analysis Data
I   Progress Database Include File (Progress Software Corporation)
I   Integra Database (Imagina Software)
I-E   i-Enforce Security File (ICM Conversions & Management)
I0   Winter Windows Scheduler File
I00   (100-103) Winphone Phonebook
I16   Nokia Phone Logo File (Nokia)
I17   Pixel Power Collage
I18   Pixel Power Collage
I1C   IBM Voice Type Language Newuser File
I1I   IBM Voice Type Language Newuser File
I2C   IBM Voice Type Language Newuser File
I2D   Wyse Device Management Thin Client Disk Image File (WYSE)
I2I   IBM Voice Type Language Newuser File
I2S   Invision for mIRC Settings
I3   Modula-3 Interface Source
I3C   IBM Voice Type Language Newuser File
I3F   I3 Fax File (Interactive Intelligence Inc.)
I3I   IBM Voice Type Language Newuser File
I3ML   I3ML Source Page
I66   Interactive66 Graphic Design Information
IA   Roland Garros Tennis Person File
IA6   IApproach Data File (Workfile) (Tdata, Inc.)
IAF   Windows Live Mail Contacts Database (Microsoft Corporation)
IAF   Outlook Express Account Settings (Microsoft Corporation)
IAF   Quikscribe Intelligent Audio File (Quikscribe Pty Ltd)
IAF   Outlook 97 and 2000 E-mail Account Settings (Microsoft Corporation)
IAF   IAFA Document
IAF   Informer Configuration (Dataconomy)
IAFA   IAFA Document
IAM   Inventor CAD (Autodesk, Inc.)
IAN   Sterling Software COOL Business Team Model File
IAO   ImperiumAO Data File (Imperium)
IAP   Iguana Active Server Active Page Script (ILan Game)
IAP   ASM Palette
IAP   TeamBG File
IAR   CD Katalog (KRISoftware)
IAS   Iguana Active Server Script (ILan Game)
IAX   IBM Image Access Executive Bitmap
IB7   Pixel Power Collage
IBA   Image
IBA   IBasic Source Code File
IBA   InfoHandler Infobase File (MDE Software)
IBC   IncrediBar Cursor File (IncrediMail Ltd.)
IBD   MySQL – InnoDB Database Table (Sun Microsystems, Inc.)
IBD   Windows Installer File (Microsoft Corporation)
IBD   PDS Picture
IBF   Instant Backup (Towodo Software)
IBG   Bert’s Dinosaurs File
IBG   NASA PDS Graphic Format
IBG   iBridge Project Workspace (i2 Inc.)
IBK   (Kodak) Imaging for Windows Bookmark (Microsoft Corporation)
IBK   ICE Book Reader Professional Book File (ICE Graphics)
IBK   National Construction Estimator 32 Picture File
IBK   Sound Blaster Instrument Bank (Creative Technology Ltd.)
IBL   IBasic Component Language File
IBL   PCLTool Index-by-Location File (Page Technology Marketing, Inc.)
IBM   Archdos Compressed File
IBM   Commodore Amiga Graphics
IBP   IsoBuster CD/DVD Layout File (Smart Projects)
IBQ   IsoBuster Optical Media Data Container File (Smart Projects)
IBS   IncrediBar Skin (IncrediMail Ltd.)
IBS   i2 iBase File
IBT   IBTracer Infiniband Link And Protocol Analyzer InfiniBand Trace File (Computer Access Technology Corporation)
IBX   Interscope BlackBox File
IBY   ROM Image Component Include File
IC   Modula-3 M3CG Intermediate Language File
IC   Spice Initial Condition
IC   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IC   ICwin Climatizaci髇 por agua Project Data (Procedimientos-Uno, S.L.)
IC1   Imagic Bitmap Graphic
IC1   ZyIMAGE Index
IC2   IMagic Bitmap Graphic
IC3   IMagic Bitmap Graphic
ICA   Identity Compass Encrypted Answers (Identity Compass International GmbH.)
ICA   Image Object Content Architecture (IOCA) Graphics File
ICA   Citrix Independent Computer Architecture File (Citrix)
ICAL   iCalendar Calendar Data (Apple Inc.)
ICALENDAR   iCalendar Calendar Data (Apple Inc.)
ICB   Image Capture Board
ICB   Targa Bitmap
ICC   Apple ColorSync 2.0 (Apple Inc.)
ICC   Kodak Printer Image
ICC   IronCAD Catalog
ICC   ICC Profile Format File
ICC   ArtIcons Pro Icon Collection (Aha-Soft)
ICC   Animation Softdisk
ICCP   Identity Compass Encrypted Culture Profile (Identity Compass International GmbH.)
ICD   Actuate Information Object Cache Definition (Actuate Corporation)
ICD   SafeDisc Encrypted Digital Rights Management File (Acresso Software Inc.)
ICD   ASTi Model Builder
ICD   File Associated with Many Games
ICD   IronCAD 2D CAD File
ICD   Rate Structure File
ICD   Rayman2 Game File
ICDX   Home Organizer Document (Imagery Concepts, LLC)
ICDX   FilePic Document (Imagery Concepts, LLC)
ICE   Freeze! Compressed Archive (Reeve Soft)
ICE   Archive
ICE   IceChat IRC Client IceChat Script File
ICE   ICEOWS Compressed File (Rapha雔 et B閍trice Mounier)
ICE   Cooltalk Audio
ICEICEBABY   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ICF   Cheyenne AntiVirus
ICF   ICOM CS-2100 Radio Programming Data
ICF   INI Creator for X10 Remote Control
ICF   RapidForm INUS Compression Format File (INUS Technology, Inc.)
ICF   Insane Chat Saved Conversation
ICG   Image Comparer Image Comparison Results (Bolide Software)
ICL   Clean File
ICL   Icon Library File
ICM   Earl F. Glynn Color Tablecolor Table
ICM   Image Color Matching Profile File (Kodak)
ICM   Windows Color Matching Control (Microsoft Corporation)
ICM   ICC Profile, Acer Monitor Drive
ICMP   Internet Control Message Protocol
ICMS   Ragtime Extensions File
ICN   HP Palmtop 100/200LX Icon
ICN   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ICN   RIPTerm Image
ICN   AT&T Graphic Format
ICN   Bert’s Dinosaurs File
ICN   Icon Programming Language Source Code File
ICN   Micrografx Icon
ICN   SunOS Mono Icon
ICNS   Macintosh OS X Icon File (Apple Inc.)
ICO   GIMP Icon (The GIMP Team)
ICO   OS/2 Icon
ICO   Sun Icon/Cursor
ICO   Windows Icon (Microsoft Corporation)
icon   UNIX Icon/Cursor
ICON   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ICON2   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ICONES   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ICONS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ICONS1   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ICONS2   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ICP   Identity Compass Encrypted Profile (Identity Compass International GmbH.)
ICP   UNIX Icontact Parameter File
ICP   InterCept File
ICP   Icarus 2.0 (Random Software)
ICPR   ArtIcons Pro IconProject (Aha-Soft)
ICQ   ICQ Saved File (ICQ Inc.)
ICR   NCSA Telnet Interactive Color Raster Graphic
ICS   Inovate 3D CAD File
ICS   Image Cytometry
ICS   SwiftView ICS Command File (SwiftView, Inc.)
ICS   Outlook Calendar File (Microsoft Corporation)
ICS   iCalendar Calendar Data (Apple Inc.)
ICS   CopyControl Generic Copier Floppy Disk Image (Microcosm Ltd.)
ICS   IronCAD 3D CAD File
ICT   TIFF and ISO Image Related File
ICTX   FilePic Transport Container (Imagery Concepts, LLC)
ICTX   Home Organizer Transport Container (Imagery Concepts, LLC)
ICV   In Chair Viewing
ICV   Bond .AVI Film
ICW   InterCAD File
ICW   MS Internet Explorer Internet Connect Wizard
ICW   Icon
ICX   More Than Words File
ICX   VisualAge Smalltalk Enterprise Program Image File (IBM)
IC_   Compressed LCT File
ID   Gamecode
ID   Disk Identification File
ID   3D Graphic
ID   Pegasus Mail (David Harris)
ID   AOL Instant Messenger (AIM) Buddy Icon (America Online, Inc.)
ID   Notes ID File (IBM)
ID   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ID   MS Data Map (Microsoft Corporation)
ID3   ID3 Resource
IDA   IIS Server File (Microsoft Corporation)
IDAPI   Integrated Database Application Programming Interface (Borland Software Corporation)
IDB   IDEA! Project Management Database (SYCON Gmbh)
IDB   Database Used by Disassembler
IDB   MS Developer Intermediate MDPX File
IDB   A-B-CD Info File
IDB   Developer Intermediate File (Microsoft Corporation)
IDB   Delphi Pascal Object File
IDC   Structured Query Language (SQL)
IDC   IDA C-like Language Source Code
IDC   Core IDC
IDC   Internet Database Connector Document
IDD   MIDI Instrument Definition
IDD   Complete Works Database-related File (Toplevel Computing)
IDE   Grand Theft Auto III Model IDs and Properties (Rockstar Games)
IDE   ideCAD Structural Structural 3D Design Model (ideYAPI Ltd. Sti.)
IDE   C++ Project (Borland Software Corporation)
IDE   ideCAD Architectural Architectural 3D Design Model (ideYAPI Ltd. Sti.)
IDE   Integrated Development Environment Configuration File
IDE   Sophos Anti-Virus Virus Identity File
IDEA   Brainbloom Document (Gael Limited)
IDEAS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IDEMO   Instant Demo Project File (NetPlay Software)
IDENTIFIER   Internet Explorer Zone Identification Information (Microsoft Corporation)
IDF   InspireData File (Inspiration Software, Inc.)
IDF   Printed Circuit Board Data Exchange File
IDF   Identification File
IDF   MIDI Instruments Definition File (Microsoft Corporation)
IDF   ARTiSAN Real-time Studio ID
IDI   i-deas Web ACCESS File
IDIF   Netscape Saved Address Book
IDK   OS/2 Saved SKF Format File (IBM)
IDL   CRiSP Harvest File
IDL   OMG CORBA Interface Definition Language
IDL   Snappy Devdocs
IDL   Visual C++ Interface Definition File (Microsoft Corporation)
IDLK   InDesign Lock File (Adobe Systems Incorporated)
IDM   Ulead Photo Express Messages File (Corel Corporation)
IDM   Fahrenheit The Game – DAT + IDM Archive (Quantic Dream)
IDMEF   Snort File
IDOL   Idle Scripting Language Object Library – Bytecode (Thomas Lauer)
IDQ   Structured Query Language (SQL) Query
IDQ   Internet Data Query File
IDR   CompactDRAW Object(s) (MediaChance)
IDS   Infinity Game Engine Numbers to Description Map (BioWare Corp.)
IDS   WFO-A Data
IDS   Minos 3D Data File
IDS   Infini-D Scene File
IDS   IDA Imported Names Format
IDSP   Gamecube Streamed Audio File (Nintendo)
IDT   Identification
IDT   Text Archive Table
IDT   Output of DLL2IDT Utility
IDT   Windows Installer File (Microsoft Corporation)
IDU   Interleaf Desktop Utility (BroadVision)
IDV   Inventor Design View Tree (Autodesk, Inc.)
IDW   IntelliDraw Vector Graphic (Adobe Systems Incorporated)
IDW   Inventor CAD (Autodesk, Inc.)
IDWORDCOUNT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IDX   Complete Works Index File (Toplevel Computing)
IDX   Ca Visual Objects Platform for Developer (CAVO) Index File (CA)
IDX   NoX
IDX   Java Applet Cache Index (Sun Microsystems, Inc.)
IDX   VSFilter Index File
IDX   Symantec Q&A Relational Database Index File (Symantec Corporation)
IDX   Stork Format Header Information
IDX   Outlook Express Mailbox Index (Microsoft Corporation)
IDX   LaTeX Index
IDX   Pro/ENGINEER Index File (PTC)
IDX   Index
IDX   ICQ Index (ICQ Inc.)
IDX   FAX File
IDX   Corel QuickFinder Information
IDX   Clip Gallery 1.x Index (Microsoft Corporation)
IDX   ArcView Geocoding Index For Read-Only Datasets (ESRI)
IDX   AOL Temporary Internet Mail File
IDX   RCA/Lyra Handheld MP3 Player Database Index (RCA)
IDX   FoxPro Index (Microsoft Corporation)
IDY   Index File
IDY   Debug Information File
IDZ   i-deas Web ACCESS File
ID_   C Poet Compressed Disk1 File
IE   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IE1-3   Internet Explorer 3 Address Book
IE3   Internet Explorer 3 File
IEE-695   IEEE 695 Information (Hewlett Packard)
IEF   Image File
IEL   particleIllusion SE Emitter Library (wondertouch, LLC)
IEL   Erazer98 File
IEM   Informix Error Message
IEPK   IE Privacy Keeper Program Settings File (BrowserTools.net)
IES   IESNA Photometric File Data (Illuminating Engineering Society)
IET   IETheme Internet Explorer Theme (Eye Can Publishing)
IF9   Pixel Power Collage
IFB   Siebel Interface Configuration File (Siebel Systems)
IFC   All Image Compressed Image File (Towodo Software)
IFD   Jet Form Design Form
IFF   TextCraft Document
IFF   The Sims Object/Data File (Electronic Arts (Maxis))
IFF   Maya IFF Bitmap
IFF   TDI Explore & Alias Wavefront Image
IFF   Sun TAAC Image File
IFF   Simple Musical Score
IFF   ProWrite Document
IFF   Philips CDI File
IFF   DESR VFF Greyscale Bitmap Image
IFF   Amiga Bitmap Graphic (Amiga)
IFF   Amiga Sound (Amiga)
IFF   Deluxe Paint Image (Electronic Arts, Inc.)
IFI   inFlow Inventory Database Backup File (inFlow Inventory Software)
IFILE   Amaya i386 File
IFL   Descent 3 Ship Graphic
IFL   3ds Max Animation File List Control (Autodesk, Inc.)
IFM   IFS Applications Message File (IFS AB)
IFM   Brighterion iPrevent Fraud Model
IFM   Shana Informed Filler
IFN   Amma Lsb v1.0 Initialization
IFO   Info File
IFO   BioWare Aurora Engine Information File (BioWare Corp.)
IFO   ImageForge Pro Graphic Object Layer Data
IFO   DVD Info File
IFP   KnowledgeMan Script
IFR   Formula 1 Racing Databin Cars Common File
IFS   Yuvpak Compressed Fractal Image
IFS   OS/2 Warp Installable File System
IFS   Fractint Iterated Function System Fractal
IFS   InfoSlips Secure Information Package (InfoSlips)
IFS   Fractint Iterated Function System Parameters
IFS   IconForge Image EXE Library
IFU   All Image Uncompressed Image File (Towodo Software)
IFX   IMAGINE Effect File
IFX   ImageSoft v2.00 Graphic
IFX   Fax File
IFX   Rational XDE (IBM)
IG   Modula-3 Generic Interface Source
IGC   SeeYou Flight Data (Naviter)
IGC   Global Positioning System Datalog File (F閐閞ation A閞onautique Internationale)
IGES   Initial 2D/3D Graphics Exchange Specification
IGES   IGES-Format
IGF   Image Systems
IGF   Sound file
IGF   Inset Systems Metafile
IGF   Hijack Graphic Bitmap
IGF   Vector Graphic
IGJ   iGrafx Published Web Content (iGrafx, a division of Corel Inc.)
IGL   IGOR Saved Level File (Elmer Productions)
IGL   inSORS IGLayout Layout File
IGM   inSORS IGClient Meeting File
IGN   ICQ Igonre List (ICQ Inc.)
IGNORE   Likely a Text File Some programs write out a temporary file with an extension like .IGNORE.
IGP   Igor Reader Sheet Music File
IGP   InfoGest Configuration/Profile Settings (S.C. NVN Group S.R.L.)
IGP   IGOR Player File (Elmer Productions)
IGR   SmartSketch Drawing (Intergraph Corporation)
IGS   CAD Overlay
IGS   Image Systems Grayscale, 8-bits
IGS   IGES-Format
IGV   inSORS IGClient Venue File
IGX   iGrafx iGrafx File (iGrafx)
IHP   Watcom Help File
IHS   Bink Inbound History
IHT   Intranet Connector Script File (SCORT)
IHTML   Inline HyperText Markup Language (Inline Internet Systems, Inc.)
II   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
II   Gcc Preprocessed C++ Source Code
II2   i-Installer Remote Installation Format (Gerben Wierda & Tom Hageman)
IIB   Notes Incremental Install Backup File (IBM)
IID   i-Installer i-Directory (Gerben Wierda & Tom Hageman)
IID   Tonline BSW4 Fnstall Lid File
IIE   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IIF   QuickBooks Import/Export Interchange File (Intuit, Inc.)
IIGS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
III   Intel IPhone Compatible File (Intel)
III   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
III   Know Your Stuff Home Inventory File (Insurance Information Institute)
III   ARC+ Drawing (ACA)
IIL   Norton CleanSweep Installation Log (Symantec Corporation)
IIM   iOpus Internet Macro (iOpus GmbH)
IIM   Music Module
IIM   Inshape Graphic
IIM   Interscope InstallMaster Setup Project
IIMG   Interleaf Graphic
IIO   CoreFSIF Database (Avanticore, Inc.)
IIT   Install Maker Install Info File (Clickteam)
IIX   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IIX   Rational XDE (IBM)
IJS   J Interpretor Script File
IJX   J Language Execution Window (Source Code) (Jsoftware)
IK   Ioke Script (Ioke Team)
IKL   InkBall (Microsoft Corporation)
IKLAX   iKlax Creator Audio Format (iKlax)
IKO   Windows Icon Resource
IKS   KBOX Heroes Card Fix File (KBOX Team)
IKS   InkSeine Document (Microsoft Corporation)
IKX   iKlax Creator Audio Format (iKlax)
IL   Euphoria Shrouded Source Code (Rapid Deployment Software)
IL   FORTRAN 90 Inline Expansion File
IL   MSIL Assembler Input File (Microsoft Corporation)
IL   Icon Library
IL   SimuPLC Electric Commands Language Instruction List (Andr� Luiz Barbosa)
IL3   particleIllusion 3 Emitter Library (wondertouch, LLC)
ILB   Scream Tracker Data
ILBM   Amiga Interleaved Bitmap Format (Amiga)
ILBM   Deluxe Paint Graphic (Electronic Arts, Inc.)
ILBM   Amiga Sound
ILD   International Laser Display Association Frame Vector List for Laser Light Shows (International Laser Display Association)
ILF   SMS Insight Log File (Ag Leader Technology, Inc.)
ILF   Omniscope Application-Specific Data (Iokio Ltd)
ILG   TeX MakeIndex Track File
ILG   InstallShield Log File (Acresso Software Inc.)
ILHT   Safari Internet Location (Apple Inc.)
ILK   Ilink Program Format Outline (Microsoft Corporation)
ILL   2D Graphic
ILL   Agati Illustrated Image
ILL   ILL Transaction File
ILL   Illustrator Prologue (Adobe Systems Incorporated)
ILM   Iomega Zip Drive Speed Configuration File
ILM   Satsang Quiz File
ILM   Opus Creator Multimedia File (Digital Workshop)
ILM   CAS 200 QDA v3.0 Image List Mode File
ILM   Amiga IFF Image (Amiga)
ILPLOPTIONS   InterLock and PowerLock
ILPLVOUCHERS   InterLock and PowerLock
ILS   Internet Security And Acceleration Server Summary (Microsoft Corporation)
ILS   Win3 Windows Word File
ILSR   Iomega Reader
ILV   ILOG View File
ILVG   iLiving P-to-P
ILX   Interlex Vocabulary (Andrew Quilley)
IM   AOL Instant Messenger (AIM) Grey Scale Image (America Online, Inc.)
IM   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IM   3D Graphic
IM   Sun Raster File
IM04   Image Sun Raster
IM1   Sun Raster File
IM24   Bitmap Graphic
IM30   Image Sun Raster
IM32   Bitmap Graphic
IM5   Visilog
IM5   Visilog (NorPix, Inc.)
IM7   DaVis Graphic (LaVision GmbH)
IM8   Sun Raster Graphic
IM?   2D Graphic
IMA   Zenographics Image
IMA   AOL Instant Messenger (AIM) Grey Scale Image (America Online, Inc.)
IMA   IncrediMail Animation (IncrediMail Ltd.)
IMA   WinImage File
IMA   ImageMixer (Pixela Corporation)
IMA   Mirage Vector Graphics
IMA   EGO – Chart – Autumn Mirage Vector Graphic
IMA4   ADPCM algorithm (Interactive Multimedia Association)
IMAGE   Squeak Code File
image   UNIX Bitmap Source
IMAGE   Disk Copy, ShrinkWrap Disk Image
IMAGE   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IMAGINE   Object & Texture Imagine 3.0
IMAKE   Imake File
IMB   IncrediMail Address Book and Temporary Contacts (IncrediMail Ltd.)
IMC   LucasArts Game Audio File (Lucasfilm Entertainment Company Ltd.)
IMC   IncrediMail (IncrediMail)
IMC   MontagePlus Thumbnail Image Collection (Serif Europe Ltd.)
IMD   ImageDisk Disk Image File
IMD   Caseware IDEA
IME   iMelody Ringtone Format (Infrared Data Association)
IME   Global Input Method Editor (Microsoft Corporation)
IME   IncrediMail Emoticons (IncrediMail Ltd.)
IMELODY   iMelody Ringtone Format (Infrared Data Association)
IMESHDEF   iMesh Skin (iMesh)
IMF   IncrediMail Letter/eCard (IncrediMail Ltd.)
IMF   MIDI Music File
IMF   ImageForge/ImageForge Image EXE Library Saved Filtered Brush
IMG   Apple Macintosh Disk Copy Format (Apple Inc.)
IMG   Ventura Publisher/GEM VDI Image Format Bitmap
IMG   Garmin Basemap (Garmin Ltd.)
IMG   Vicar
IMG   All Image Raw Image (Towodo Software)
IMG   CloneCD Image (SlySoft Inc.)
IMG   Bitmap Graphic
IMG   Alias Bitmap Graphic
IMG   ERDAS IMAGINE Image Format (Leica Geosystems , LLC)
IMG   AutoCAD CAD-Camera (Autodesk, Inc.)
IMG   QEMU Qcow Disk Image (Fabrice Bellard)
IMG   Starbase
IMG   ADEX Corporation ChromaGraph Graphics Card Bitmap Graphic
IMG   Img Software Set Bitmap
IMG   Grand Theft Auto III .DFF and .TXD Archive (Rockstar Games)
IMG   Vivid Ray-tracer
IMG   Idrisi32 Raster Image
IMG   Grand Theft Auto III File (Rockstar Games)
IMG   Image Whatnot / Erdas Imagine MIS / Radiance / Starbase
IMG   Microtek Eyestar
IMG   Planetary Data System
IMG   Disk Copy, ShrinkWrap Disk Image
IMG   Radiance Scene Description Image
IMG   Sharp GPB
IMG3   Img3 Encrypted/Signed Container
IMGSAO   Aleph One Images (Marathon Open Source)
IMH   IncrediMail Data File (IncrediMail Ltd.)
IMI   IncrediMail Animation (IncrediMail Ltd.)
IMI   Turbo Pascal DOS File (Borland Software Corporation)
IMJ   JFIF File With a Microsoft Windows BMP Header
IMJ   Pegasus Image Corp Bitmap
IMK   IncrediMail License License (IncrediMail Ltd.)
IML   ACT! Internet Mail Message File (Best Software CRM Division)
IMM   IncrediMail Trash (IncrediMail Ltd.)
IMN   IncrediMail Notifier (IncrediMail Ltd.)
IMO   iMON Setting File (SoundGraph.Inc)
IMOVIEPROJ   iMovie Project (Apple Inc.)
IMP   Pascal Implementation
IMP   TEX-DESIGN Clothing Design File (Koppermann Computersysteme GmbH)
IMP   Improv Spreadsheet (IBM)
IMP   WinIMP Archive (Technelysium Pty Ltd)
IMP   Crayola Art Image
IMP   Urban Chaos Game File
IMP   Bentley CloudWorx High Definition Surveying High Resolution Image (Bentley Systems, Incorporated)
IMP   Gemstar eBook Publisher eBook (Gemstar eBook)
IMP   FileMaker Database Translation Filter
IMP   DVD File
IMP   Babya Installer Archive
IMP   Adobe Audition Convolution Effect (Adobe Systems Incorporated)
IMPD   Viva Impose Template (VIVA)
IMPLEMENT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IMQ   NASA Planetary Image
IMQ   ImageQ Presentation
IMR   Impromptu Report Writer Report (Cognos Incorporated)
IMR   Information Magic Data File (RM)
IMR   IncrediMail Notifier (IncrediMail Ltd.)
IMS   SiteSpinner Project (Virtual Mechanics Inc.)
IMS   IconForge
IMS   Rebel Assault File
IMS   IncrediMail Graphic Skin (IncrediMail Ltd.)
IMS   Music File
IMS   IMS Content Package (IMS Global Learning Consortium, Inc.)
IMSP   Survey Pro Survey File (iMagic Software)
IMT   IMNET Image
IMT   egseing Image Mode
IMU   Star Wars Force Commander Game Audio (Lucasfilm Ltd.)
IMV   ImageMixerVCD Project File (Pixela Corporation)
IMV   Yahoo! Instant Messenger IMVironment
IMW   IncrediMail Sound (IncrediMail Ltd.)
IMW   Imageware Surfacer 3D CAD Surface Geometry
IMX   SAS SAS/IML Workshop Matrix (SAS Institute Inc.)
IMX   DaVis Binary Image File (LaVision GmbH)
IMY   iMelody Ringtone Format (Infrared Data Association)
IMZ   WinImage Compressed Disk Image (Gilles Vollant Software)
IMZ   Floppy Image Compressed Image (Towodo Software)
IM_   Improve Compressed Audio File
IN   CFAST Input File (U.S. Commerce Department)
IN   McAfee Antivirus
IN   smartGENERATOR Template (BITPlan)
IN   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
in   GNU Autoconf Configuration Template
IN$   HP NewWave Install File
IN0   INI Backup
IN1   INI Backup
IN3   Harvard Graphics Input Device Driver (Harvard Graphics)
IN4   InfoBlaster IN4 Registry Library (UIC Phoenxsoftware)
IN7   Ox Object-Oriented Matrix Programming Language PcGive 7 Data File
INA   DOS File
INB   Vermont HighTest Script
INB   Visual Expert Source Code Documentation
INB   Rebel Assault Backup
INB   Motorola L7 Phone MMS Graphic (Motorola, Inc.)
INC   PovRay 2 or 3
INC   Wincommander Include File
INC   Spice Include File Subcircuit
INC   PSpice Include File (Cadence Design Systems, Inc.)
INC   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INC   MS-Backup Incremental File
INC   JAWS for Windows Text File (Freedom Scientific)
INC   Internet Connection File
INC   Include File
INC   Astro Windows
INC   Assembler Language or Active Server Include File
INC   Active Server Include File
INCA   InCopy/InDesign File (Adobe Systems Incorporated)
INCD   InCopy/InDesign Link File (Adobe Systems Incorporated)
INCH   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INCT   InCopy/InDesign File (Adobe Systems Incorporated)
INCX   InCopy/InDesign File (Adobe Systems Incorporated)
IND   InDesign Publication (Adobe Systems Incorporated)
IND   AOL Thumbnails Index File
IND   Windows/Applog Index
IND   Windows Shared Database File
IND   Well of Souls Game File
IND   LaTeX or TeX Makeindx Index
IND   dBASE IV
IND   Foxmail E-Mail Box Index
IND   XMap Dataset Index (Delorme)
IND   Notes List files for Compact Task on Domino Server (IBM)
INDD   InDesign Document (Adobe Systems Incorporated)
INDENT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INDESIGNPLUGIN   InDesign Plug-in (Adobe Systems Incorporated)
INDEX   Index File
INDEX   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INDIGO   Indigo Graphics Format [Eddi Litvak]
INE   Imagination Configuration Settings (Foxpertise)
INF   Pro/ENGINEER Temporary File (PTC)
INF   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INF   OS/2 Buch Hypertext Help System File
INF   Autorun File
INF   BLUEWAVE Information File
INF   Type Manager Font Information (Adobe Systems Incorporated)
INF   Type 1 LaserJet Font Information File
INF   Information or Setup File
INF   OS/2 2.0 Information Presentation Facility (IPF) Data Format OS/2 PTR file : Cursor image file
INF1   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INFINI-D   Infini-D 3.0 Format
INFO   ZoomBrowser Image Index (Canon, Inc.)
info   UNIX GNU Info Reader File
INFO   Amiga Icon (Amiga)
INFO   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INFO1   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INFO2   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INFO3   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INFO4   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ING   MasterCook Ingredients
ING   INGVAR Forestry Simulation (Skogforsk)
INGR   Intergraph Raster File Format (Intergraph Corporation)
INH   Visual Basic Basfwin File
INI   Simple Exchange Rate Information File Format (SERIFF)
INI   MWave DSP Synth’s GM-setup File: MWSYNTH.INI
INI   Initialization/Configuration File
INI   Gravis UltraSound Bank Setup File
INIT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INK   Mimio Ink File
INK   Pantone Reference File
INK   Intkey Startup Configuration File (DELTA Authors)
INK   Ink Markup Language File (W3C)
INK   Tablet PC Digital Ink File (Microsoft Corporation)
INKBL   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INKML   Ink Markup Language File (W3C)
INL   Visual C++ Inline Function File (Microsoft Corporation)
INLOVE   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INLX   InDesign Library Interchange (Adobe Systems Incorporated)
INM   Fax Master File
INN   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INN   COBOL/2 Overlay (Micro Focus)
INN   PHANTASMAGORIA INI File
INO   Inno Setup Script Files File
INO   Inor IPRO Software File
INP   Abaqus/CAE Input File (Dassault Syst鑝es)
INP   Self-Extracting Archive Utility Project
INP   ABAQUS Input File (ABAQUS, Inc.)
INP   Oracle Source Code
INP   InPage Document (Concept Software)
INP   EnCorr Input File (Morningstar)
INP   GIS Software Text Input File
INP   FRANC2D Mesh File
INP   Tramo-Seats Input Specification File (Bank of Spain)
INP   MPlus Statistical Input File
INP   CHARMM Input File
INP   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INP   MacMolPlt GAMESS Input format
INPUT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INQ   Piped Technology Internet Query Configuration File (Queensgate Systems Ltd)
INRS   INRS-Telecommunications Sound
INS   Sample Cell / II Instrument
INS   InstallShield Script (Acresso Software Inc.)
INS   WordPerfect (Corel Corporation)
INS   Inspiration Mind Mapping Software File (Inspiration Software, Inc.)
INS   IIS Internet Communications Settings (Microsoft Corporation)
INS   PUT Compressed File Archive (MicroFox Company)
INS   WinAHX THX Tracker Instrument (Abyss)
INS   REAKTOR Instrument (Native Instruments)
INS   AdLib Instrument Music File
ins   LaTeX Install File for docstrip
INS   1st Reader Install Script
INS   Ensoniq EPS Family Instrument (E-MU Systems)
INS   Systems Management Server (SMS) Advertising Instruction File (Microsoft Corporation)
INSCRIBE   InScribe 2004 Egyptian Hieroglyphs Document (Saqqara Technology Ltd.)
INSID   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INSPECT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INST   Object Oriented Graphics Library (OOGL)
INST   3D Graphic
INST   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INST2   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INSTALL   Likely a Text File
INSTALL   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INSTALLER   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INSTR   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INSTRUC   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INSTRUCT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INSURANCE   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INSURANCE2   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INT   Signature Semi-compiled Program
INT   Unreal Tournament Mutator
INT   Intermediate Code Used for Syntax Checking
INT   Foxpro Code Page (Microsoft Corporation)
INT   Delphi Interface Unit (Borland Software Corporation)
INT   Devastation Language File (NovaLogic)
INT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTEGER   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTER   Interspector Project File
INTEREST   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTERIEUR   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTERLEAV   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTERLOCKFAVOURITES   InterLock and PowerLock
INTERNETMAILSEND   Internet Mail Send Powertoy File
INTERRUPT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTKEY   Intkey Startup Configuration File (DELTA Authors)
INTMATH   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTO   Interspector Object File
INTREC   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTRO   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTRODUCT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INTRODUCTION   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INU   INSPEC Configuration File
INV   dnaLIMS Invoice File (dnaTools)
INV   Medlin Accounting Current Year Checks and Invoices (Medlin Accounting)
INV   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INV   Rainbow Six: Rogue Spear Inventory File (Red Storm Entertainment, Inc.)
INV   Windows Update file
INV   Lineage Inventory File (NC Interactive, Inc.)
INVADERS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INVEN   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INVENTOR   Open Inventor File Translator How To [SGI]
INVENTORY   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INVERT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
INV_LOWRES   Rainbow Six: Rogue Spear Inventory File (Red Storm Entertainment, Inc.)
INX   ACL for Windows Index
INX   Foxpro Foxbase Index
INX   Rational XDE (IBM)
INX   InstallShield Compiled Rules File (Acresso Software Inc.)
IN_   Setup Information (Microsoft Corporation)
IN~   King’s Quest 7, Grabriel Knight, Compressed File
IO   Compressed Archive
IO   Modula-3 Object File
IO   IO Language Script (Steve Dekorte)
IOB   Turbo Silver TDDDB Format
IOB   TDDD Format 3D Graphic Database
IOB   iOnly ME Website Generator Backup (iOnly)
IOB   Imagine Ver. 1 or 2 TDDDB Format
IOB   Imagine File
IOB   3D Object TDDDB Format
IOB   Actuate Information Object (Actuate Corporation)
IOC   Instant ORGcharting! Organization Chart
IOC   Winamp Io Plug-in (File: IMGORG.IOC) (Nullsoft)
IOCA   Image Object Content Architecture (IOCA) Graphics File
IOD   DVGate DVMotion In/Out List
IOF   Findit Document (Microsoft Corporation)
IOF   Findit Document
IOK   Omniscope Data and Configuration File (Visokio)
IOM   Omniscope Data and Configuration File (Visokio)
ION   Mascot Data
ION   Installation Description
ION   NewsLeecher Description File (newsleecher.com)
ION   4DOS File Description
IOP   iOnly ME Website Generator File (iOnly)
IP   Profile
IP   Internet Protocol
IP   Interactive Physics Data (Design Simulation Technologies, Inc.)
IP   NRC Inspection Manual Inspection Procedures
IP   IconPackager Theme (Stardock Corporation)
IP3   particleIllusion 3 Project (wondertouch, LLC)
IPA   iPhone/iPod Touch Application (Apple Inc.)
IPC   Interactive Publisher Pro Church Edition Project Data (Interactive Software Designs)
IPC   IncrediFlash Tools Image File (IncrediTools Software)
IPCC   iTunes iPhone Carrier Update (Apple Inc.)
IPD   BlackBerry Backup File (Research In Motion Limited)
IPD   ImpactCAD Drawing (Arden Software)
IPD   InstallPROG 6 EDBS Install Database
IPE   Wacom Pen SYSTEM.INI and WIN.INI Backup
IPE   Microth Stroke Set (Microth, Inc.)
IPE   ItsPersonal File
IPF   F-Secure Incremental Policy File (F-Secure)
IPF   SMS Installer Script (Microsoft Corporation)
IPF   particleIllusion SE Project (wondertouch, LLC)
IPF   Interchangeable Preservation Format (Classic Amiga Preservation Society)
IPF   Grand Theft Auto III Animation Data (Rockstar Games)
IPFG   iPFG 2.4 Client Data File (Phonak Group)
IPFG 2.4   iPFG Client Data File
IPG   Mindjongg Format
IPG   iPod Game Package (Apple Inc.)
IPH   InterPaint Hires Image
IPJ   Inventor Project (Autodesk, Inc.)
IPJ   InfinityQS SPC Project File (InfinityQS International)
IPK   NRG iPack File
IPK   Sharp Zaurus PDA Application Install File
IPK   internet PacKage Archive (direct Netware Group)
IPK   Nintendo DS Packed Images
IPL   PLATO Web Learning Network (PWLN) Temporary File (PLATO Learning, Inc.)
IPL   IPLab IPLab-format Image File (BD Biosciences)
IPL   InstallPROG 6 EDBS File Library
IPL   Corel Pantone Spot Reference Palette
IPL   Grand Theft Auto III Object Placement Data (Rockstar Games)
IPL   Ink Palette
IPL22   PLATO Web Learning Network (PWLN) Temporary File (PLATO Learning, Inc.)
IPLI   IPLab Graphic
IPM   Image Pro Plus Ver. 5 Macro (Media Cybernetics Inc.)
IPN   Inventor Presentation (Autodesk, Inc.)
IPOD   Rockbox Executable Application (The Rockbox Crew)
IPP   Help & Manual Proprietary Image (EC Software GmbH)
IPR   SMART Ideas Document (SMART Technologies Inc.)
IPR   IntelliJ Project XML File
IPR   LiveType Animation File (Apple Inc.)
IPR   InstallShield Project (Acresso Software Inc.)
IPS   Game Patch File
IPS   IPScript File
IPS   MENSI 3Dipsos (MENSI Corporation)
IPS   International Patching System Binary Patch File
IPSW   iPhone/iPod Firmware Update File (Apple Inc.)
IPT   The Palace Cyborg Script
IPT   InterPaint Multicolor Image
IPT   Inventor CAD (Autodesk, Inc.)
IPTC   Newswire Profile
IPTHEME   IconPackager Icon Theme Package (Stardock Corporation, Inc.)
IPU   Vocaltech Iphone Internet Phone User File
IPW   UniPlot Graph
IPX   Interactive Pictures Corporation AV File
IPX   Ipix Spherical Panorama (Enliven Marketing Technologies Corporation)
IPZ   ICQ Skin (ICQ Inc.)
IQ   IBM Query File
IQA   AmeriCalc Application
IQB   AmeriCalc Backup
IQC   AmeriCalc Client File
IQC   CADIQ Comparison Analysis Result File (ITI TranscenData)
IQD   Webstir File
IQD   AmeriCalc Database
IQF   Integra 3.0 Query File
IQI   IBM Query
IQJ   CADIQ Specific Tasks/Analysis Details (ITI TranscenData)
IQL   CADIQ Log File (ITI TranscenData)
IQP   20-20 Office Sales Exported Quote (20-20 Technologies)
IQP   ITEM QRAS Project (ITEM Software, Inc.)
IQR   CADIQ View Analysis Results (ITI TranscenData)
IQR   IBM Query
IQS   CADIQ Summary Log File (ITI TranscenData)
IQS   AmeriCalc Security File
IQT   IBM Query
IQU   AmeriCalc Update
IQY   Excel Web Query (Microsoft Corporation)
IQY   Internet Inquiry (Microsoft Corporation)
IR   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IRC   jIRCii Script (Raffi)
IRC   IRCAM Format Sound
IRC   Nevo Infra-red Device Code (Universal Electronics Inc.)
IRCD   iArcade Game Package (Brooklyn Games, Inc.)
IRD   KBOX Heroes Factory File (KBOX Team)
IRD   IRD Append File
IRD   Money Temporary File (Microsoft Corporation)
IRF   RoomBox 6 IR Code File (Living Control)
IRF   Phonecat2 Ocp97 File
IRI   Thermography Studio Infrared Image (GORATEC Technology GmbH & Co. KG)
IRI   IRT Cronista Infrared Image (GRAYESS Inc.)
IRIS   Silicon Graphics RGB
IRIX   Irix Make File
IRIX6   Irix 6 File
IRIX64BIT   Irix 64 Bit Make File
IRK   iArcade Game Package (Brooklyn Games, Inc.)
IRL   ILOG JRules ILOG Rule Language File (ILOG, Inc.)
IROCK   rockWare intelliRock Data File (Engius, LLC)
IRP   InfraRecorder Project (Christian Kindahl)
IRS   WordPerfect Resource File (Corel Corporation)
IRTP   Graphicon-2000 Interactive Real-Time PHIGS Graphic
IRV   XMap Workfile (ImageReg) (Delorme)
IRX   Brewer Lamp Irradiation File
IRX   PS2 Modified Elf Object File
IRX   IBM Mainframe Rule File
IRZ   iROS Application Packaging Unit (Interactive Workspaces Project, Stanford University)
IS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IS   Modula-3 Intermediate Assembly File
IS2   IRT Cronista Infrared Image (GRAYESS Inc.)
IS?   LoseThos CD-ROM Image (Terry A. Davis)
ISB   IS-Builder Link File (NPO Computer)
ISBN   HM3 Tutorial Software
ISC   RVS-COM Prepaid SMS Package File (Living Byte Software GmbH)
ISC   iScreensaver Designer Project File (Xochi Media Inc.)
ISC   Internet Servide Providers Configuration File
ISC   GRDSOZ4W ISCII File
ISC   Xilinx Integrated Software Environment Device Configuration Information (Xilinx, Inc.)
ISD   GraphPad InStat
ISD   dynaSight File
ISD   InstallShield Dialog (Acresso Software Inc.)
ISD   RapidFile Dictionary
ISF   Inspiration Concept Map (Flowchart) Document (Inspiration Software, Inc.)
ISF   Tektronix Instrument Data File (Tektronix, Inc.)
ISF   ZerOS Saved Show (Zero 88)
ISF   InfoNet Snapshot File (Wallingford Software Ltd.)
ISF   ModelPress Highly-compressed CAD Model (Informative Graphics Corporation)
ISFF   Intergraph Standard File Format (Intergraph Corporation)
ISH   Image Speeder
ISH   Compressed Archive File
ISH   Image System
ISK   Command File
ISL   InstallShield Temporary Installer File (Acresso Software Inc.)
ISL   The Universal Game Server Export File (The Universal Development Team)
ISL   DB-MAIN Scheme File
ISL   Inno Setup 1.3 File
ISM   MySQL ISAM Table Handler Data (MySQL AB)
ISM   SimulationX Encrypted Model (ITI Gesellschaft f黵 ingenieurtechnische Informationsverarbeitung mbH)
ISM   Image System
ISML   Intershop Enfinity
ISO   InstallShield Uninstall File (Acresso Software Inc.)
ISO   ISO-9660 Table
ISO   RichWin
ISO   Sega CD/Sony Playstation Game File (Sega of America, Inc.)
ISO   Cimagraphi CAD File (Graphitech Ltd)
ISO   LoseThos CD-ROM Image (Terry A. Davis)
ISO   ISO-9660 CD Disc Image
ISO   Easy CD Creator Disc Image (Sonic Solutions)
ISO   CALS ISO 8613 Bitmap
ISO   Virtual PC Virtual CD-ROM Image (Microsoft Corporation)
ISOD   CloneDVD ISO Image (Elaborate Bytes AG)
ISP   Internet/Internationnal Communication Settings parameter file
ISP   Internet Sign-up File
ISP   Internet Communication Settings
ISP   IIS Internet Service Provider Settings (Microsoft Corporation)
ISQ   MicroCT Image (SCANCO Medical AG)
ISR   Uninstaller Text File
ISR   Go-Moku Game File
ISR   Streets & Trips Route File (Microsoft Corporation)
ISS   Caseware IDEA IDEAScript
ISS   Inno Setup Script (Jordan Russell’s Software)
ISS   InstallShield Response File (Acresso Software Inc.)
ISS   ISS Graphic
ISS   The Longest Journey Sound File (Funcom)
IST   Digitrakker Instrument File
IST   Imagine Staging Stage Editor File (Impulse, Inc.)
IST   IsoStar Library of Intermolecular Interactions (The Cambridge Crystallographic Data Centre)
IST   TeX MakeIndex Style Index
IST   ImageStyler (Adobe Systems Incorporated)
IST   Systems Management Server (SMS) Remote Instruction File (Microsoft Corporation)
ISTG   Imagine Staging Stage Editor File (Impulse, Inc.)
ISTR   IsoStar Library of Intermolecular Interactions (The Cambridge Crystallographic Data Centre)
ISU   Netscape File
ISU   InstallShield Uninstall Script (Acresso Software Inc.)
ISU   Easy CD Creator 4 Uninstall File
ISZ   WinMount Compressed ISO Image (WinMount International Inc.)
ISZ   UltraISO ISO Zipped Format (EZB Systems, Inc.)
IT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IT   Intalk Settings
IT   Impulse Tracker Music Module
IT   VisIT Topographic Map Data (Kort & Matrikelstyrelsen)
IT   Read.it
IT   Sound
IT3   Internet Timer 3 Log File
ITA   IconTweaker Theme
ITA   Personal Paint Italian Language User Interface File (Amiga)
ITA   Italian README File
ITA   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ITAL   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ITALIC   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ITC   Uthscsa Imagetool Calibration File
ITC   iTunes Cover Flow Data File (Apple Inc.)
itcl   tcl 00 Extension
itcl   itcl Source Code
ITD   SDL Trados Translation File (SDL)
ITE   E-Tabs Reader File
ITEMS   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
ITF   JPI TopSpeed Pascal Interface File
ITF   Inside Tract File
ITG   Intergraph Format (Intergraph Corporation)
ITH   InTether Receiver File (Infraworks Corporation)
ITHMB   iPod photo Thumbnail Image (Apple Inc.)
ITI   Impulse Tracker Instrument
ITL   iTunes Music Database File (Apple Inc.)
ITL   ITEM ToolKit Library (ITEM Software, Inc.)
ITL   IntelliTipster League File (IntelliForecast Labs)
ITM   Diablo II Item (Blizzard Entertainment)
ITM   Infinity Game Engine Inventory Object (BioWare Corp.)
ITM   Item / Article / Zone
ITP   BioWare Aurora Engine Palette (BioWare Corp.)
ITP   IconTweaker Plug-in
ITP   riteMail Mail and Notes File (Pen&Internet, LLC)
ITP   ITEM ToolKit Project File (ITEM Software, Inc.)
ITR   IntroCreator Project File (Klaus Schwenk)
ITR   Icy Tower Replay (Johan Peitz, Free Lunch Design)
ITS   International Translation
ITS   Impulse Tracker Sample
ITS   Internet Document Set
ITU   Sheffield Dictionary File
ITW   IT Works Database (Simple Solutions)
ITW   Icetips Wizard Editor
ITX   Igor Chromatogram File
ITX   ISB Raw Song Format
ITX   Impulse Imagine for Windows
ITX   ITRANS Multilingual Transliteration Scheme
ITX   Texture IMAGINE
ITZ   Amiga and PC Tracker Module
ITZ   Impulse Tracker Music Module
IUM   infoUSA Network Meter File (infoUSA.com, Inc.)
IUT   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IV   Open Inventor (Silicon Graphics, Inc.)
IV   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IV   VRML File
IV-VRML   Inventor VRML Format Document
IV2I   Ghost Disk Drive Image (Symantec Corporation)
IVB   Truevision Targa Format Bitmap
IVC   iView MediaPro Catalog (iView Multimedia Ltd.)
IVD   Beyond 20/20 Microdata Dimension or Variable-level File
IVD   ISPS for Windows Multi-dimensional Data Store (International Planning & Research Corporation)
IVE   OpenSceneGraph Native Binary Format (OSG Community)
IVF   Indeo Video File (Intel Corporation)
IVI   MSDN InfoViewer 5.0 Topic (Microsoft Corporation)
IVN   iView MediaPro Catalog Notepad File (iView Multimedia Ltd.)
IVNU   Inetba Web Page (Inetba)
IVP   Beyond 20/20 User Subset Profile
IVP   Truevision Targa Bitmap
IVP   PhotoSuite Ver 4 Image-based Virtual Reality Text File (Sonic Solutions)
IVQ   MSDN InfoViewer 5.0 index full-text searches
IVR   RealPlayer Internet Video Recording (RealNetworks, Inc.)
IVR   Virtual Reality World Live Picture
IVS   TronMe Multimedia File (3D Solar UK Ltd.)
IVS   ISPS for Windows Settings File (International Planning & Research Corporation)
IVS   ImageView Storage File (Infinite Solutions)
IVS   iVisit
IVT   MSDN InfoViewer 5.0 Information Title
IVT   Beyond 20/20 Table
IVT   Concordance Inverted Full Text Database File
IVU   IVUE Live Picture Drawing
IVU   ImmerVision XML User Interface (ImmerVision)
IVUE   Live Picture Multi-view Format
IVWD   IntelliVIEW Designer Data/Layout File (Synaptris; products division of Cybernet Software Systems, Inc.)
IVWL   IntelliVIEW Designer Report Layout File (Synaptris; products division of Cybernet Software Systems, Inc.)
IVWR   IntelliVIEW Offline Report File (Cybernet Software Systems Inc.)
IVWR   IntelliVIEW Designer Report File (Synaptris; products division of Cybernet Software Systems, Inc.)
IVX   Beyond 20/20 Extract
IW   IBM Updater File
IW   Idlewild Screensaver
IW   Iconware Application
IW   IconAuthor – HSC InterActive Presentation Flowchart
IW2   Information Workshop 2000 Data File (BlackCat)
IW3   InfoWeb 3 Web Page (Tietotalo)
IW4   DjVu File
IWA   IBM Writing Assistant Text
IWC   Installwatch Database
IWC   WaveL Wavelet Compressed Bitmap (WaveL Software)
IWD   Call of Duty Map – Game Data Archive (Activision, Inc.)
IWI   Ignite Image Optimiser
IWI   Call of Duty Skin (Activision, Inc.)
IWM   IconAuthor Start File (AimTech Corp)
IWP   InfinityQS SPC Web Publishing Configuration (InfinityQS International)
IWP   Wang Text File
IWR   i*write 2.0 File
IWR_BAK   i*write 2.0 Backup File
IWS   InstallWatch Scan Results (Epsilon Squared)
IWS   Information Workshop Data File (BlackCat)
IWZ   ItemWizard File
IX   Modula-3 Linker Information
IX   WordPerfect Office Template File (Corel Corporation)
IX   WordPerfect Office Template File (Corel Corporation)
IX   PaperPort Search File (ScanSoft Inc.)
IX   FrameMaker Index File (Adobe Systems Incorporated)
IX1   Rebel Chess Program Database File
IX2   WordPerfect Office Calendar File Calendar File (Corel Corporation)
IX2   Rebel Chess Program Database File
IX2   WordPerfect Office Template File (Corel Corporation)
IX3   Rebel Chess Program Database File
IX3   Instant.EXE 3.0 Script (ASXperts Inc.)
IX4   Rebel Chess Program Database File
IXA   Ulead Image File (Corel Corporation)
IXB   Ulead Video Image File (Corel Corporation)
IXC   ArcView Geocoding Index For Read-Write Coverages (ESRI)
IXC   Index+ for Windows Code Definition File (System Simulation Ltd.)
IXD   Videoalive Indexer Extracted Closed Captions and Metadata (Videoalive.com)
IXE   InterEX Control File
IXF   Index+ for Windows Form Defintion File (System Simulation Ltd.)
IXF   IFX for FAX FAX Document
IXL   DB/TextWorks Database Indexed List (Inmagic, Inc.)
IXP   ISIPublisher Publication Information Export (Image Solutions, Inc.)
IXR   Index+ for Windows Report Definition File (System Simulation Ltd.)
IXS   ArcView Geocoding Index For Read-Write Shapefiles (ESRI)
IXT   ISIPublisher Publication Template (Image Solutions, Inc.)
IXX   C++ Include File
IYP   Instyler Project File (Instyler Software)
IZD   Intrexx Application Export Format
IZER   Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
IZS   1st Page 2000 JavaScript Example File (Evrsoft)
IZT   IZL Binary Token
IZX   Intermezzon Designer E-Learning Published File (Intermezzon Learning Systems AB)
I_I   Eru/erd File

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