| cab | Microsoft Cabinet File |
| cam-pkg | CircuitCAM Design Package |
| cap | JavaCard Converted Applet |
| car | Oracle Documaker CAR Archive |
| carb | Apple Carbon Package |
| carc | Nintendo DS Compressed Archive |
| caz | CAZIPXP Compressed Archive |
| ca_ | Compressed Microsoft Cabinet File |
| cbi | Crossbeam XMS Installation Package |
| cbu | Comodo Backup Archive |
| ccgame | XNA Game Studio Creators Club Package |
| ccip | Curse Client Install Package |
| ccslider | Character Creator Morph Slider Data |
| ccz | CommCare Package |
| cfs | Compact File Set |
| cgdb | Microsoft Office Clip Art Package |
| chksplit | Incredible Bee Archiver Split Checksum |
| chz | ChArc Compressed Archive |
| ci3 | Crimson 3 Image |
| cig | Fastback Plus Compressed Backup |
| cjl | DigitalHIWAY Concatenated JPEG Library |
| cl2arc | Comic Life 2 Document Archive |
| cmp | Microsoft SharePoint Content Migration Package |
| cmpack | Aptify CM Tool Package |
| cnr | CNR Installation Package |
| cod | BlackBerry COD Archive |
| colpkg | Anki Fashcard Collection Package |
| costylepack | Capture One Style Package |
| cp9 | ChoicePoint Encrypted |
| cpack | Cpack Archive |
