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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .IBA | Lectra | CAD Files | Lectra Clothing Design Pieces File | Apple iBooks | Apple |
| .IBOOKS | Apple | eBook Files | Multi-Touch iBook | Apple iBooks | Apple |
| .ICAL | Open Source | Uncommon Files | iCalendar File | Apple Calendar | Apple |
| .ICALENDAR | Open Source | Uncommon Files | iCalendar File | Apple Calendar | Apple |
| .ICC | Corel | Settings Files | International Color Consortium Profile File | ColorSync | Apple |
| .ICO | The GIMP Development Team | System Files | Icon File | Apple Preview | Apple |
| .ICS | IronCAD, LLC | CAD Files | IronCAD 3D CAD Drawing File | Apple Calendar | Apple |
| .IFF | Electronic Arts | Audio Files | Interchange File Format | Apple QuickTime Player | Apple |
| .IFO | Various Developers | Video Files | DVD-Video Disc Information File | Apple DVD Player | Apple |
| .IFV | Intel Corporation | Video Files | Indeo Video Format File | Apple QuickTime Player | Apple |
| .IIL | Symantec Corporation | Data Files | Norton CleanSweep Installation Log File | Apple TextEdit | Apple |
| .IL | Microsoft Corporation | Uncommon Files | MSIL Assembler Input File | Apple TextEdit | Apple |
| .IMAGE | Apple | Disk Image Files | Apple Disk Image | Disk Copy | Apple |
| .IMG | Unknown Developer | Disk Image Files | Disk Image Data File | Disk Copy | Apple |
| .IMG3 | Apple | System Files | Apple iOS Img3 Encrypted Or Signed Container | Apple iTunes | Apple |
| .IMOVIEPROJ | Apple | Video Files | iMovie Project File | Apple Final Cut Pro | Apple |
| .IMT | Intuit, Inc. | Data Files | My Time Data File | macOS | Apple |
| .INFO | GNU Project | Uncommon Files | Texinfo Document | Apple TextEdit | Apple |
| .INSID | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .INSTALLER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .INSTR | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .INTEGER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .INTRO | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .ION | Open Source | System Files | File Description File | Apple TextEdit | Apple |
| .IPA | Apple | Executable Files | Apple iOS Application | Apple iTunes | Apple |
| .IPB | Apple | Uncommon Files | iPhone Perl Script | Apple iOS | Apple |
| .IPCC | Apple | Settings Files | iPhone Carrier Bundle | Apple iTunes | Apple |
| .IPG | Apple | Compressed Files | iPod Game File | Apple iTunes | Apple |
| .IPR | Flexera Software | Developer Files | InstallShield Project | Apple Final Cut Pro | Apple |
| .IPS | ZeroSoft Zophar | Game Files | Internal Patching System Patch File | Apple QuickTime Player | Apple |
| .IPSW | Apple | Uncommon Files | iPod And iPhone Software Update File | Apple iTunes | Apple |
| .ISO | Igor Pavlov | Disk Image Files | Disc Image File | Apple Disk Utility | Apple |
| .ITC | Apple | Uncommon Files | iTunes Cover Flow Data File | Apple iTunes | Apple |
| .ITC2 | Apple | Raster Image Files | iTunes Cover Flow Data File 2 | Apple iTunes | Apple |
| .ITE | Apple | Data Files | iTunes Extras File | Apple iTunes | Apple |
| .ITL | Apple | Data Files | iTunes Library File | Apple iTunes | Apple |
| .IVF | Intel Corporation | Video Files | Indeo Video Format File | Apple QuickTime Player | Apple |
| .IVS | Thomas d'Otreppe de Bouvette | Data Files | Initialization Vector File | Apple QuickTime Player | Apple |
| .IWA | Apple | Encoded Files | iWork Archive File | iWork | Apple |
| .IWS | JetBrains | Developer Files | IntelliJ IDEA Web Page | Apple Safari | Apple |
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