| c07 | WinAce Archive |
| c08 | WinAce Archive |
| c09 | WinAce Archive |
| c10 | WinAce Archive |
| caa | CleanApp Archive |
| cab | Microsoft Cabinet File |
| cap | JavaCard Converted Applet |
| caz | CAZIPXP Compressed Archive |
| ca_ | Compressed Microsoft Cabinet File |
| cbi | Crossbeam XMS Installation Package |
| cbu | Comodo Backup Archive |
| ccip | Curse Client Install Package |
| cfs | Compact File Set |
| chksplit | Incredible Bee Archiver Split Checksum |
| chz | ChArc Compressed Archive |
| ci3 | Crimson 3 Image |
| cig | Fastback Plus Compressed Backup |
| cjl | DigitalHIWAY Concatenated JPEG Library |
| cmp | Microsoft SharePoint Content Migration Package |
| cod | BlackBerry COD Archive |
| colpkg | Anki Fashcard Collection Package |
| cp9 | ChoicePoint Encrypted |
| cpack | Cpack Archive |
| cpct | Compact Pro Archive |
| cpgs | cPGS Addon Package |
| cpgz | Gzip Compressed CPIO Archive |
| cpio | CPIO Archive |
| cru | Crush Compressed Archive |
| crx | Chrome Extension |
| cryptomite | CryptoMite Encrypted Archive |
