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