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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .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 |
| .CR2 | Canon Inc. | Camera Raw Files | Canon Digital Camera Raw Image File | Apple Photos | Apple |
| .CRACK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CRASH | Apple | System Files | Mac OS X Crash Log File | Apple TextEdit | Apple |
| .CRD | Open Source | Uncommon Files | Guitar Tabs | Apple Pages | Apple |
| .CRT | Mozilla | Web Files | Security Certificate | Apple Safari | Apple |
| .CRUNCH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CSH | Adobe Systems Incorporated | Uncommon Files | Photoshop Custom Shapes File | Apple Terminal | Apple |
| .CSK | Apple | Compressed Files | ClarisWorks Data | Apple AppleWorks | Apple |
| .CST | Smith Micro Software | Page Layout Files | Manga Studio Story File | Logic Pro X | Apple |
| .CURVE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CW3 | Apple | Data Files | ClarisWorks Document | Apple Pages | Apple |
| .CWK | Apple | Data Files | ClarisWorks Document | Apple Pages | Apple |
| .CWS | ChordWizard Software Pty Ltd | Audio Files | ChordWizard Songtrix Song | Apple AppleWorks | Apple |
| .CXX | Embarcadero Technologies | Developer Files | C++ Main Source Code File Format | Apple Xcode | Apple |
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