| bxw | Pedigree Central Database Index |
| by | PSpice Data |
| bz1 | WinTOTAL Automatic Backup Data |
| bzf | Tobii Dynavox Compass User Data |
| bzx | SIR 4000 Quick3D Grid Assembly Data |
| c1 | POV-Ray Include File |
| c1b | Digital Tachograph Data |
| c1w | Capture One Work Data |
| c2 | POV-Ray Include File |
| c21 | CARE-S InfoWorks Defined Pollutant Detail Data |
| c2e | NJStar Chinese WP Dictionary Index |
| c2r | Windows Media Center Click-to-record File |
| c2s | G7 Click2Stitch Embroidery Design |
| c3d | Chem3D Template File |
| c3d | Coordinate 3D Data |
| c3e | Cype Data |
| c3t | Chem3D Template File |
| c3xml | Chem3D XML Format File |
| c4d | Maxon Cinema 4D Object |
| c4dupdate | Maxon Cinema 4D Update Data |
| c4p | CrossOver v9 C4P Installer |
| c64 | PC64 Saved Session |
| ca | OpenSSL Certificate Authority Data |
| ca | Initial Telnet Cache |
| ca1 | STABCAL Calculation Data |
| ca2 | STABCAL Calculation Data |
| ca3 | Casio WK-1800 Save All Data |
| ca3 | STABCAL Calculation Data |
| ca4 | STABCAL Calculation Data |
| cae | Abaqus/CAE Model Database |
| cag | Microsoft ClipArt Gallery Database |
| cah | Ulead Photo Explorer Thumbnail Cache |
| cal | Keysight PLTS Calibration Data |
| cal | Radiance Function File |
| cal | Lego Mindstorms NXT Sensor Calibration Data |
