| ca3 | Casio WK-1800 Save All Data |
| ca3 | STABCAL Calculation Data |
| ca4 | STABCAL Calculation Data |
| cabal | Haskell Cabal Data |
| cache-2 | VLC Media Player Font Cache |
| cache-3 | VLC Media Player Font Cache |
| cae | Abaqus/CAE Model Database |
| cag | Microsoft ClipArt Gallery Database |
| cah | Ulead Photo Explorer Thumbnail Cache |
| cal | Radiance Function File |
| cal | Lego Mindstorms NXT Sensor Calibration Data |
| cal | Keysight PLTS Calibration Data |
| cal3d | Cal3D Data |
| caldb | HEASARC Calibration Database |
| calibre | Calibre Device Information 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 |
| cap | Libpcap Captured Packets |
| caps | CaptureSaver Knowledge Base |
| capt | Linrock Capito Data |
| car | PC 1000 Calculation Result Data |
| caro | Adobe Acrobat Creator Code |
| castep | CASTEP Data |
| cat | TINA Pro Catalog |
| cat | Quicken IntelliCharge Categorization |
| cat4d | Maxon Cinema 4D Catalog |
| catalog | Catia Catalog |
| catnls | CATIA NLS Data |
| catraster | CATIA Raster Data |
| catshape | CATIA Shape Data |
| cav | Kintraks Database |