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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .I3A | Zepetto | Game Files | Point Blank Game Data File | I3Play | Ini3 Digital PLC |
| .I3ANIMPACK | Zepetto | Game Files | Point Blank Game Data File | I3Play | Ini3 Digital PLC |
| .I3CHR | Zepetto | Game Files | Point Blank Game Audio Data | Point Blank | Zepetto |
| .I3EXEC | Zepetto | Game Files | Point Blank Game Data File | I3Play | Ini3 Digital PLC |
| .I3PACK | Zepetto | Game Files | Point Blank Game Data File | I3Play | Ini3 Digital PLC |
| .I3S | Zepetto | Game Files | Point Blank Game Data File | I3Play | Ini3 Digital PLC |
| .IAO | Imperium Games | Game Files | ImperiumAO Game Data | ImperiumAO | Imperium Games |
| .IBF | Square Enix | Game Files | Final Fantasy XI Game Data | Final Fantasy XI | Square Enix |
| .IBT | Eidos Interactive | Game Files | Texture And Model File | Deadly Shadows | Eidos Interactive |
| .ICD | Macrovision Corporation | Game Files | SafeDisc Encrypted Program | SafeDisc | Macrovision Corporation |
| .ID | IBM | Game Files | Lotus Notes User ID File | IBM Lotus Notes | IBM |
| .IDE | Rockstar Games | Game Files | GTA Item Definition File | Grand Theft Auto IV | Rockstar Games |
| .IDM | Ulead Systems | Game Files | Ulead Photo Express Messages File | Ulead Photo Express | Ulead Systems |
| .IDS | BioWare | Game Files | BioWare Infinity Game Engine Data | Baldur's Gate | BioWare |
| .IFL | Autodesk, Inc. | Game Files | 3ds Max Image File List | Autodesk 3ds Max | Autodesk, Inc. |
| .IFP | Rockstar Games | Game Files | GTA Animation File | Grand Theft Auto IV | Rockstar Games |
| .IFR | Sony | Game Files | Formula One 2001 Game File | Formula One 2001 | Psygnosis |
| .IKL | Microsoft Corporation | Game Files | InkBall Game Data | InkBall | Microsoft Corporation |
| .IM | Sun Microsystems | Game Files | SunOS Grey Scale Bitmap Picture | SunOS | Sun Microsystems |
| .IMC | LucasArts Entertainment Company, LLC | Game Files | LucasArts Game Sound | X-Wing Alliance | LucasArts Entertainment Company, LLC |
| .IMG | Unknown Developer | Game Files | Disk Image Data File | IsoBuster | Smart Projects |
| .IMS | CursorArts Company | Game Files | IconForge Create Executable Library Data | IconForge | CursorArts Company |
| .IMU | LucasArts Entertainment Company, LLC | Game Files | Star Wars Force Commander Audio File | Star Wars: Force Commander | LucasArts Entertainment Company, LLC |
| .INB | LucasArts Entertainment Company, LLC | Game Files | Rebel Assault Backup | Star Wars: Rebel Assault | LucasArts Entertainment Company, LLC |
| .INDEX | The Eclipse Foundation | Game Files | Eclipse Help Index | Eclipse CDT | The Eclipse Foundation |
| .INFO | GNU Project | Game Files | Texinfo Document | GNU Emacs | GNU Project |
| .INN | Micro Focus International plc | Game Files | Micro Focus COBOL/2 Overlay File | IBM COBOL | IBM |
| .INP | Concept Software | Game Files | Urdu InPage Document | Urdu InPage | Concept Software |
| .INV | Copyboy | Game Files | INVedit File | INVedit | Copyboy |
| .IO | Open Source | Game Files | CPIO Compressed File Archive | Linux | Open Source |
| .IOP | Z8Games | Game Files | Lost Saga Game Data | Lost Saga | I.O. Entertainment |
| .IPL | Rockstar Games | Game Files | GTA Item Placement File | Grand Theft Auto III | Rockstar Games |
| .IPS | ZeroSoft Zophar | Game Files | Internal Patching System Patch File | MultiPatch patching tool | Open Source |
| .ISB | Sony | Game Files | Vanguard Music File | Vanguard: Saga of Heroes | Sony |
| .ISD | Flexera Software | Game Files | Flexera InstallShield Dialog Box File | InstallShield | Flexera Software |
| .ISR | Open Source | Game Files | GoMoku Game File | Gomoku | Open Source |
| .ITM | isee systems | Game Files | iThink Model File | iThink Architect | isee systems |
| .ITP | BioWare | Game Files | Bioware Palette Data | BioWare Neverwinter Nights | BioWare |
| .ITR | Free Lunch Design | Game Files | File TypeIcy Tower Replay File | Icy Tower | Free Lunch Design |
| .IVT | AddGames Italia | Game Files | International Volleyball 2006 Data File | International Volleyball 2006 | AddGames Italia |
| .IWD | Activision | Game Files | Call Of Duty Game Data File | Corel WinZip 21 | Corel |
| .IX3 | Lokasoft | Game Files | Rebel Chess Program File | Rebel | Lokasoft |
| .IX4 | Lokasoft | Game Files | Rebel Chess File | Rebel | Lokasoft |
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