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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ATOM | YKOON BV | Web Files | Atom Syndication Format | Apple Safari | Apple |
| .ATTR | Apple | Data Files | iPhoto Attributes File | Apple iPhoto | Apple |
| .AU | Open Source | Audio Files | Audacity Audio File | Apple QuickTime Player | Apple |
| .AUDIO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .AVI | Microsoft Corporation | Video Files | Audio Video Interleave File | Apple QuickTime Player | Apple |
| .AWB | Nokia | Audio Files | AMR-WB Audio File | Apple QuickTime Player | Apple |
| .AWK | Free Software Foundation | Developer Files | AWK Script | Apple TextEdit | Apple |
| .AX | Open Source | Plugin Files | DirectShow Filter | Apple QuickTime Player | Apple |
| .B | Rockstar Games | Game Files | Grand Theft Auto 3 Saved Game File | Apple Pages | Apple |
| .BALL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BAND | Apple | Audio Files | GarageBand Project File | Apple GarageBand 10 | Apple |
| .BANNER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BASH | Apple | Developer Files | Unix Bourne Shell (Bash) Script | Mac OS X Terminal | Apple |
| .BATCH | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .BATH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BCS | The Wavelength | Settings Files | Batch Compiler Specification File | Apple TextEdit | Apple |
| .BEACON | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BEAT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BEATWAVE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BI | Microsoft Corporation | Data Files | Binary File | Apple TextEdit | Apple |
| .BILL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BIN | Unknown Developer | Disk Image Files | Binary Disk Image File | Safari | Apple |
| .BITMAP | Various Developers | Raster Image Files | Bitmap Image File | Apple Photos | Apple |
| .BLACK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BLACKMORE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .BLANK | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .BLG | Microsoft Corporation | Data Files | Windows Binary Performance Log File | Apple TextEdit | Apple |
| .BLOCK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BLOCKS | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .BLOSSOMS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BLURB | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BMAP | Apple | Font Files | Apple Macintosh Screen Font | Apple OS X | Apple |
| .BMK | return7, LLC | Backup Files | BillMinder Backup File | Apple TextEdit | Apple |
| .BML | Various Developers | Web Files | Bean Markup Language File | Safari | Apple |
| .BMP | Various Developers | Raster Image Files | Bitmap Image File | Apple Photos | Apple |
| .BOK | Pearson | Data Files | TestGen Testbank File | Apple Safari | Apple |
| .BOM | Apple | System Files | Mac OS X Bill Of Materials File | Apple OS X | Apple |
| .BONGO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BOOK | Adobe Systems Incorporated | Data Files | FrameMaker Book File | Apple iBooks | Apple |
| .BOR | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BOX | Unknown Developer | Data Files | E-mail Mailbox | Apple Mail | Apple |
| .BSC | Microsoft Corporation | Developer Files | Visual Studio Source Browser Information File | BinSCII | Apple |
| .BSQ | ESRI | GIS Files | ArcView Band Sequential Image | BinSCII | Apple |
| .BTREE | Apple | Database Files | Apple Mac OS HFS+ B-tree File | Apple OS X | Apple |
| .BTV | Apple | Database Files | AppleTalk Desktop Database | macOS | Apple |
| .BUB | Apple | Uncommon Files | Photobubble File | Apple QuickTime Player | Apple |
| .BUFFER | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .BUNDLE | Apple | Plugin Files | Mac OS X Application Bundle | macOS | Apple |
| .BUP | Various Developers | Backup Files | Backup File | Apple DVD Studio Pro | Apple |
| .BURST | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .BUSH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BWP | Fluffy Smoke Entertainment | Web Files | BuRg3r Web Page | Apple TextEdit | Apple |
| .BZ | Smith Micro Software | Compressed Files | Bzip Compressed File | Apple Archive Utility | Apple |
| .BZ2 | Julian Seward | Compressed Files | Bzip2 Compressed File | Apple Archive Utility | Apple |
| .C0 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .C9 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CAF | Apple | Audio Files | Apple Core Audio File | Apple QuickTime Player | Apple |
| .CAFF | Apple | Audio Files | Core Audio File | Apple QuickTime Player | Apple |
| .CAL | Newera Software Technology, Inc. | Raster Image Files | CALS Raster File | Apple Calendar | Apple |
| .CALC | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CALCULATOR | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .CASTLE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .CDA | Microsoft Corporation | Audio Files | CD Audio Track Shortcut | Apple iTunes | Apple |
| .CDDA | Microsoft Corporation | Audio Files | CD Digital Audio File | Apple iTunes | Apple |
| .CDEV | Apple | Uncommon Files | Macintosh II Control Panel File | macOS | Apple |
| .CDR | Corel | Vector Image Files | CorelDRAW Vector Image File | Apple Disk Utility | Apple |
| .CEL | Affymetrix | Data Files | Affymetrix Probe Results File | Apple TextEdit | Apple |
| .CELX | Open Source | Executable Files | Celestia Script File | Apple TextEdit | Apple |
| .CER | Microsoft Corporation | Web Files | Internet Security Certificate | Apple Safari | Apple |
| .CERT | AOL | Web Files | Netscape Certificate Index | Apple Keychain Access | Apple |
| .CF | Proofpoint, Inc. | Settings Files | Sendmail Configuration File | Apple Pages | Apple |
| .CFG | Unknown Developer | Developer Files | Configuration File | Apple TextEdit | Apple |
| .CHARSET | Sublime HQ Pty Ltd | Text Files | Character Set | Apple TextEdit | Apple |
| .CHM | Microsoft Corporation | Web Files | Compiled HTML Help File | Apple Safari | Apple |
| .CHORD | Open Source | Text Files | Song Chords File | Apple TextEdit | Apple |
| .CIK | Corel | Settings Files | Corel Graphics 10 Custom Dual Tone File | Apple TextEdit | Apple |
| .CIL | Symantec Corporation | Data Files | Norton CleanSweep Installation Log File | Apple TextEdit | Apple |
| .CITY | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .CLAP | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .CLASS | Oracle Corporation | Developer Files | Java Class File | Apple Jar Launcher | Apple |
| .CLEANER | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .CLOSED | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .CMBL | Vernier Software & Technology | Data Files | Logger Pro Data File | Vernier Graphical Analysis | Apple |
| .CML | Unknown Developer | Data Files | Chemical Markup Language File | Apple TextEdit | Apple |
| .CMS | Opera Software | Web Files | Content Management System Web Page File | Safari | Apple |
| .CNF | MySQL AB | Settings Files | MySQL Configuration File | Mac OS X Terminal | Apple |
| .COBRA | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .COLLECTION | Adobe Systems Incorporated | Data Files | Adobe Bridge Collection File | macOS | Apple |
| .CONF | Unknown Developer | Settings Files | Generic Configuration File | Apple TextEdit | Apple |
| .CONFIG | Unknown Developer | Developer Files | Configuration File | Apple TextEdit | Apple |
| .CONVERTER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .COOKIES | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CORRECT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CP | Apple | Developer Files | Xcode C++ Source File | Apple Xcode | Apple |
| .CPC | Cartesian Products, Inc. | Raster Image Files | CPC Compressed Image File | Apple Safari | Apple |
| .CPGZ | Open Source | Compressed Files | Compressed UNIX CPIO Archive | Apple Archive Utility | Apple |
| .CPI | Sony | Video Files | AVCHD Video Clip Information | Apple Final Cut Pro | Apple |
| .CPIO | Power Software Ltd | Encoded Files | Unix CPIO Archive | Apple Archive Utility | Apple |
| .CPQ | Compaq | System Files | Compaq OEM Disc Configuration File | Apple TextEdit | Apple |
| .CPT | Corel | Raster Image Files | Corel Photo-Paint Image | Apple DVD Studio Pro | Apple |
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