| cal | Radiance Function File |
| cal | Lego Mindstorms NXT Sensor 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 |
| caw | SSIS Cache Data |
| cb1 | CARE-S InfoWorks Biochemical Oxygen Detail Data |
| cb3 | CliBench Mk III Data |
| cb4 | Actuate Analytics Cube Data |
| cb5 | CubeAnimator LED Data |
| cba | DB/TextWorks SQL Textbase Definition |
| cbb | DB/TextWorks SQL Textbase Structure Definition |
| cbc | MODFLOW Cell-by-cell Flow Data |
| cbg | CyberGauge Data File |
| cbin | CACTVS Binary File |