List of Data File Formats Starting with the Letter "I"
| .i | Intermediate file (Borland C++ 4.5) |
| .iaf | MS Outlook 97 and 2000 e-mail account settings |
| .iax | Bitmap graphics (IBM Image Access eXecutive) |
| .ibm | Compressed file archive created by ARCHDOS (Internal IBM only) |
| .ibd | Installer Dialog Resource file |
| .ibp | Isobuster Image file |
| .ibq | Isobuster Managed Image file |
| .ica | Bitmap graphics (Image Object Content Architecture) |
| .icb | Bitmap graphics |
| .icc | Kodak Printer Image |
| IronCAD Catalog | |
| .icd | IronCAD 2D CAD file |
| .icl | Icon library (ActivIcons, IconForge, ImageForge, ImageForge PRO) |
| .icm | Image Color Matching Profile file |
| ICC Profile, Acer Monotor Drive | |
| .icn | Icon source code file |
| .ico | Icon (Windows 3.x) |
| .ics | iCalendar Calendar file |
| .id | Disk identification file |
| Lotus Notes User ID file | |
| .id2 | Windows Live Messenger Emoticon file |
| .idb | Database Used by Disassembler |
| MS Developer Intermediate file | |
| .ide | Project (Borland C++ 4.5) |
| .idf | ARTiSAN Real-time Studio ID file |
| MIDI Instruments Drivers file | |
| .idl | MS Visual C++ Interface Definition file |
| OMG CORBA Interface Definition Language | |
| .idw | Vector graphics (IntelliDraw) |
| .idx | Index (many - FoxPro) |
| .ies | Photometric file data |
| .ifd | Form (JetForm Design) |
| .iff | Interchange File Format bitmap graphics/sound (Amiga) |
| Maxis The Sims Object file | |
| Philips CDI File | |
| Sun TAAC Image File Format (SDSC Image Tool) | |
| .ifo | Saved graphic objects (ImageForge PRO) |
| .ifp | Script (KnowledgeMan) |
| .ifs | Fractal image compressed file (Yuvpak) |
| System file (OS/2) hpfs.ifs | |
| .igr | Intergraph SmartSketch Drawing |
| .igs | IGES-Format |
| .igx | iGrafx Process |
| .iif | QuickBooks for Windows Interchange file |
| .ilb | Data (Scream Tracker) |
| .ilk | Outline of program's format (MS ILink incremental linker) |
| .im30 | Sun Raster image file |
| .im8 | Sun raster graphics |
| .ima | Mirage vector graphics (EGO, Chart, Autumn) |
| .imb | IncrediMail file |
| .imc | IncrediMail file |
| .imd | Caseware IDEA (GIS data file) |
| .imf | ImageForge/IconForge saved filtered brushes(IconForge, ImageForge, ImageForge PRO) |
| .img | Bitmap graphics (Ventura Publisher - GEM Paint) |
| .imm | IncrediMail Trash |
| .imn | IncrediMail Notifier |
| .imp | Spreadsheet (Lotus Improv) |
| Impaticized PowerPoint file | |
| .imq | Image presentation (ImageQ) |
| .ims | Incredimail Graphic |
| .imv | Yahoo Instant Messenger IMVironment |
| Impaticized Video format | |
| .imw | Imageware Surfacer 3D CAD Surface Geometry |
| IncrediMail Sound | |
| .imz | Compressed floppy image |
| .in$ | Installation file (HP NewWave) |
| .in3 | Input device driver (Harvard Graphics 3.0) |
| .inb | Test script (Vermont HighTest) |
| .inc | Include file (several programming languages) |
| .ind | Index (dBASE IV) |
| Adobe InDesign document file | |
| .indd | Adobe InDesign file format |
| .inf | Type 1 LaserJet font information file (soft font installers) |
| Information text file (ASCII) | |
| Install script | |
| .ini | Initialization file |
| .ink | Pantone reference fills file (CorelDRAW) |
| .inl | MS Visual C++ Inline Function file |
| .inp | GIS Software Text Input file |
| Oracle Source Code | |
| Self-Extracting Archive Utility Project | |
| .ins | Data (WordPerfect) |
| Installation script (1st Reader) | |
| Instrument music file (Adlib) | |
| .int | Borland Interface Units |
| Program saved in Internal (semi-compiled) format (Signature) | |
| .inv | Rogue Spear Inventory file |
| .inx | Foxpro Index (Foxbase) |
| .io | Compressed file archive created by CPIO |
| .iob | 3d graphics database in TDDD format |
| .ioc | Organizational chart (Instant ORGcharting!) |
| .ion | 4dos descript.ion file (file descriptions) |
| .ipa | iPod/iPhone Application file |
| .ipd | BlackBerry Backup file |
| InstallPROG 6 EDBS Install Database | |
| .ipg | Mindjongg Format |
| .ipj | Impatica OnCue Project file |
| .ipl | Pantone Spot reference palette file (CorelDRAW) |
| .ipp | Help & Manual Proprietary Image |
| .ips | Game Patch file |
| MENSI 3Dipsos | |
| .ipsw | IPod/IPad/IPhone Software file |
| .ipx | IPIX AV file |
| .ipz | ICQ Skin Plus |
| .iri | IR Image file |
| .irs | Resource (WordPerfect) |
| .isd | Spelling Checker dictionary (RapidFile) |
| .ish | Compressed file archive created by ISH |
| .isk | Command file |
| .iso | Easy CD Creator Disc Image |
| File List for CD-ROM | |
| InstallShield Uninstall file | |
| ISO Buster file | |
| ISO-9660 Table | |
| RichWin | |
| Vector Graphics (IsoDraw Illustration) | |
| .isr | MS Streets & Trips Route file |
| .iss | InstallShield Response file |
| ISS Graphic | |
| .ist | Digitrakker Instrument File (n-FaCToR) |
| .isu | InstallShield Uninstall Script |
| Easy CD Creator 4 Uninstall file | |
| Netscape file | |
| .isz | An extension on .ISO that allows compression and splitting of an archive |
| .it | Settings (intalk) |
| .itc2 | iTunes Album Data file |
| .itdb | iTunes Database file |
| .itf | Interface file (JPI TopSpeed Pascal) |
| .ith | InTether technology secured file |
| .itl | Music Library file |
| .iv | OpenInventor files (the successor to Inventor) |
| .iva | security video data file |
| .ivt | MS Infoviewer Title |
| .iw | Presentation flowchart (IconAuthor - HSC InterActive) |
| .iwa | Text file (IBM Writing Assistant) |
| .iwd | Call of Duty Game Data file |
| .iwp | Text file (Wang) |
| .izt | Izl binary token file (IZL) |
