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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .FLI | Autodesk, Inc. | Video Files | FLIC Animation | Apple QuickTime Player | Apple |
| .FLV | Adobe Systems Incorporated | Video Files | Animate Video File | Apple QuickTime Player | Apple |
| .FLX | Autodesk, Inc. | Video Files | FLIC Animation | Apple QuickTime Player | Apple |
| .FONT | LucasArts Entertainment Company, LLC | Font Files | Font Data | Apple OS X | Apple |
| .FOR | MacroMates | Developer Files | Fortran 77 Source File | Apple Xcode | Apple |
| .FORMATTER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FORUM | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .FP | FileMaker Inc. | Spreadsheet Files | FileMaker Pro Spreadsheet | OpenGL | Apple |
| .FPBF | Apple | System Files | Mac OS X Burn Folder | Apple OS X | Apple |
| .FPP | The Eclipse Foundation | Developer Files | Fortran Source Code | Apple Xcode | Apple |
| .FPX | Kodak | Raster Image Files | FlashPix Bitmap Image File | Apple Preview | Apple |
| .FS | Microsoft Corporation | Developer Files | Visual F# Source File | Apple OS X | Apple |
| .FSSCRIPT | Microsoft Corporation | Developer Files | Visual F# Script File | Apple TextEdit | Apple |
| .FSX | Microsoft Corporation | Developer Files | Visual F# Script File | Apple TextEdit | Apple |
| .FTN | The Eclipse Foundation | Developer Files | Fortran Source Code | Apple Xcode | Apple |
| .GAME | Apple | Game Files | Apple Chess Saved Game | Apple Chess | Apple |
| .GEOJSON | Open Source | GIS Files | GeoJSON File | Apple Xcode | Apple |
| .GFW | Open Source | GIS Files | GIF World File | Apple Pages | Apple |
| .GIF | The GIMP Development Team | Raster Image Files | Graphical Interchange Format File | Apple Safari | Apple |
| .GNE | Ludicorp | Web Files | Flickr Web Page | Apple Safari | Apple |
| .GPD | Microsoft Corporation | Text Files | Generic Printer Description File | Apple QuickTime Player | Apple |
| .GPL | Open Source | Text Files | GNU Public License Text File | Apple TextEdit | Apple |
| .GRAPHICS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .GSPLUS | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .GTAR | Free Software Foundation | Data Files | GNU Tar Archive | Apple Archive Utility | Apple |
| .GZ | GNU Project | Compressed Files | Gnu Zipped Archive | Apple Archive Utility | Apple |
| .H | The Eclipse Foundation | Developer Files | C/C++/Objective-C Header File | Apple Xcode | Apple |
| .H264 | Ulead Systems | Video Files | H.264 Encoded Video File | Apple iTunes | Apple |
| .HAML | Sublime HQ Pty Ltd | Developer Files | HTML Abstraction Markup Language File | Apple TextEdit | Apple |
| .HARP | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HCO | Apple | Audio Files | Macintosh Sound Resource Fork File | macOS | Apple |
| .HDM | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Apple Pages | Apple |
| .HDML | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Apple Pages | Apple |
| .HDMOV | Apple | Video Files | QuickTime HD Movie File | Apple QuickTime Player | Apple |
| .HDT | Adobe Systems Incorporated | Settings Files | Photoshop HDR Toning Preset File | Apple TextEdit | Apple |
| .HEAD | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HEADER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HEIC | Moving Picture Experts Group | Raster Image Files | High Efficiency Image Format | Apple iOS | Apple |
| .HEIF | Moving Picture Experts Group | Raster Image Files | High Efficiency Image Format | Apple iOS | Apple |
| .HELP | Apple | System Files | Mac OS X Help Book | macOS | Apple |
| .HELPER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HEY | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HH | Microsoft Corporation | Developer Files | C++ Header File | Apple Xcode | Apple |
| .HIGH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HINT | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .HOLLY | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .HPP | Microsoft Corporation | Developer Files | C++ Header File | Apple Xcode | Apple |
| .HPRT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .HRL | Ericsson Computer Science Laboratory | Developer Files | Erlang Header File | Apple TextEdit | Apple |
| .HSK | Huskey Truss & Building Supply | Data Files | Huskey Truss & Building Supply Import File | Apple TextEdit | Apple |
| .HT | Hilgraeve Inc | Settings Files | HyperTerminal Session File | Apple Safari | Apple |
| .HTM | Various Developers | Web Files | Hypertext Markup Language File | Apple Safari | Apple |
| .HTML | Various Developers | Web Files | Hypertext Markup Language File | Apple Safari | Apple |
| .HTML5 | Sublime HQ Pty Ltd | Developer Files | HTML5 Hypertext Markup Language Revision 5 Source Code | Apple TextEdit | Apple |
| .HVC | Sublime HQ Pty Ltd | Text Files | ASCII Text | Apple TextEdit | Apple |
| .H__ | Microsoft Corporation | Developer Files | C++ Header File | Apple Xcode | Apple |
| .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 |
| .J | Oracle Corporation | Developer Files | Java Source File | Safari | Apple |
| .J2K | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Apple QuickTime Player | Apple |
| .JAR | Oracle Corporation | Compressed Files | Java Archive File | Apple Safari | Apple |
| .JAV | Oracle Corporation | Developer Files | Java Source Code | Apple TextEdit | Apple |
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