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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .IBF | Square Enix | Compressed Files | Final Fantasy XI Game Data | Final Fantasy XI | Square Enix |
| .IBM | Commodore International | Compressed Files | Commodore Amiga Graphics Data | Ability Office | Ability Plus Software |
| .ICE | Raphaël et Béatrice Mounier | Compressed Files | ICE File Archive | ALZip | ESTsoft |
| .IFU | Towodo Software | Compressed Files | Towodo All Image | All Image | Towodo Software |
| .INV | Copyboy | Compressed Files | INVedit File | INVedit | Copyboy |
| .IO | Open Source | Compressed Files | CPIO Compressed File Archive | Linux | Open Source |
| .IPG | Apple | Compressed Files | iPod Game File | Apple iTunes | Apple |
| .IPK | Open Source | Compressed Files | Itsy Package | Debian software (dpkg) | Open Source |
| .IRZ | Open Source | Compressed Files | iROS Application Packaging Unit | iROS | Open Source |
| .ISH | Interscape | Compressed Files | ISH Compressed Archive | HiroRAR | Interscape |
| .ISX | ESI ITI GmbH | Compressed Files | SimulationX Project | SimulationX | ESI ITI GmbH |
| .ITA | Unknown Developer | Compressed Files | IconTweaker Theme Archive | IconTweaker | Unknown Developer |
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