| calib | Chief Architect Library |
| calibre | Calibre Device Information Data |
| calibz | Chief Architect Library Archive |
| cam | ADS40 Camera Calibration Data |
| cam | Minolta Vivid 3D Scanner Camera Data |
| cam | PC 1000 Calculation Method Data |
| cam-ft | CircuitCAM Footpring Library |
| cam-gmc | CircuitCAM GMC Library |
| camp | WCS Color Appearance Model Profile |
| camt | SEPA CAMT Data |
| can3 | Live2D Cubism 3 Basic Motion Data |
| canf | CanOpener Data |
| cannedsearch | Mac OS X Finder Predefined Search Data |
| cap | Libpcap Captured Packets |
| caps | CaptureSaver Knowledge Base |
| capt | Linrock Capito Data |
| car | PC 1000 Calculation Result Data |
| caro | Adobe Acrobat Creator Code |
| cascii | CACTVS Chemical ASCII Format Data |
| castep | CASTEP Data |
| cat | Quicken IntelliCharge Categorization |
| cat | TINA Pro Catalog |
| cat4d | Maxon Cinema 4D Catalog |
| catalog | Catia Catalog |
| catfct | CATIA CATfct Data |
| catnls | CATIA NLS Data |
| catom | Chief Architect Catalogue Data |
| catraster | CATIA Raster Data |
| catshape | CATIA Shape Data |
| catswl | CATIA CATswl Data |
| catsystem | CATIA Functional Systems Data |
| cav | Kintraks Database |
| caw | SSIS Cache Data |
| cb1 | CARE-S InfoWorks Biochemical Oxygen Detail Data |
| cb3 | CliBench Mk III Data |