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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .AS | Adobe Systems Incorporated | Developer Files | Adobe ActionScript File | macOS | Apple |
| .BTV | Apple | Database Files | AppleTalk Desktop Database | macOS | Apple |
| .BUNDLE | Apple | Plugin Files | Mac OS X Application Bundle | macOS | Apple |
| .CDEV | Apple | Uncommon Files | Macintosh II Control Panel File | macOS | Apple |
| .CHM | Microsoft Corporation | Web Files | Compiled HTML Help File | macOS | Apple |
| .COLLECTION | Adobe Systems Incorporated | Data Files | Adobe Bridge Collection File | macOS | Apple |
| .DMG | Apple | Disk Image Files | Mac OS X Disk Image File | macOS | Apple |
| .DUMP | Microsoft Corporation | System Files | Dump File | macOS | Apple |
| .F6 | Various Developers | Font Files | Fonts File | macOS | Apple |
| .F7 | Various Developers | Font Files | Fonts File | macOS | Apple |
| .F8 | Various Developers | Font Files | Fonts File | macOS | Apple |
| .HCO | Apple | Audio Files | Macintosh Sound Resource Fork File | macOS | Apple |
| .HELP | Apple | System Files | Mac OS X Help Book | macOS | Apple |
| .IMT | Intuit, Inc. | Data Files | My Time Data File | macOS | Apple |
| .LPROJ | Apple | Developer Files | Localized Project Folder | macOS | Apple |
| .MENU | id Software | Game Files | Quake 3 Engine Menu File | macOS | Apple |
| .METADATA_NEVER_INDEX | Apple | System Files | Spotlight Never Index File | macOS | Apple |
| .MKEXT | Apple | System Files | Mac OS X Mach Kernel Extension Memory Cache | macOS | Apple |
| .OSX | Apple | Executable Files | PowerPC Executable File | macOS | Apple |
| .PANIC | Open Source | System Files | Kernel Panic File | macOS | Apple |
| .PKG | Apple | Compressed Files | Apple MacOS Installer Package | macOS | Apple |
| .PPC | Garmin | GIS Files | XMap Flight Plan Statistic File | macOS | Apple |
| .PREF | Unknown Developer | Settings Files | Preferences File | macOS | Apple |
| .SUI | Sean Maxwell | Data Files | StarSplatter User Interface File | macOS | Apple |
| .T2 | RM Education | Data Files | Textease 2000 File | macOS | Apple |
| .VAC | Ipswitch, Inc. | Data Files | IMail Server Vacation Message File | macOS | Apple |
| .VBR | Microsoft Corporation | Developer Files | Visual Basic Remote Automation Registration | macOS | Apple |
| .VOL | Open Source | Game Files | Video Game Archive | macOS | Apple |
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