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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .ICS | IronCAD, LLC | Audio Files | IronCAD 3D CAD Drawing File | IronCAD | IronCAD, LLC |
| .IDD | Adobe Systems Incorporated | Audio Files | Adobe InDesign For Mac Document | Adobe InDesign | Adobe Systems Incorporated |
| .IFF | Electronic Arts | Audio Files | Interchange File Format | IrfanView | Open Source |
| .IGP | Open Source | Audio Files | Igor Published Music Notation File | NoteHeads Igor Reader | Open Source |
| .IGR | Interscape | Audio Files | Igor Engraver File | Igor Engraver | Interscape |
| .IKX | iKlax Media | Audio Files | iKlax Creator Audio | iKlax Creator | iKlax Media |
| .ILB | Open Source | Audio Files | Scream Tracker Data | Scream Tracker 3 | Future Crew |
| .IMF | id Software | Audio Files | Id Music File | CocoModX | Open Source |
| .IMP | Lotus Software | Audio Files | Improv Spreadsheet File | Lotus 1-2-3 | IBM |
| .IMW | Unknown Developer | Audio Files | Imageware Surfacer 3D CAD Surface Geometry File | Unknown Software | Unknown Developer |
| .IM_ | Unknown Developer | Audio Files | Improve Compressed Audio File | Unknown Software | Unknown Developer |
| .INI | Microsoft Corporation | Audio Files | Windows Initialization File | Notepad++ | Don Ho |
| .INS | Open Source | Audio Files | LaTeX Installer Script | Microsoft Notepad | Microsoft Corporation |
| .ISS | Jordan Russell | Audio Files | Inno Setup Script | Microsoft Notepad | Microsoft Corporation |
| .IST | Flexera Software | Audio Files | InstallShield Project Template File | InstallShield | Flexera Software |
| .IT | Open Source | Audio Files | Impulse Tracker Module | ModPlug Player | Open Source |
| .ITI | Open Source | Audio Files | Impulse Tracker Instrument | CocoModX | Open Source |
| .ITS | Open Source | Audio Files | Impulse Tracker Sample | CocoModX | Open Source |
| .ITZ | Microsoft Corporation | Audio Files | Impulse Tracker Music Module | Impulse Tracker | Open Source |
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