| cud | ChmUpDate Data |
| cudt | ClarisWorks User Dictionary Data |
| cuix | Autodesk AutoCAD Custom User Interface |
| cul | Cubloc Studio PLC Information |
| cul | IconForge Cursor Library |
| cul | Petrosys Culture Data |
| cul | Windows Cursor Library |
| cup | Naviter SeeYou Waypoint Data |
| cur | Oasys T/HIS Curve File |
| current | WhatsApp Messenger Encrypted Database |
| cursorfx | CursorFX Theme |
| curv | Genetica Mathematical Curve |
| curve | ANSYS TurboGrid Curve File |
| curxptheme | CursorXP Theme |
| cus | Autodesk AutoCAD Custom Dictionary |
| cus | Medlin Payroll Software Customers Data |
| cus | Payroll Mate Customer Data |
| cus | WindLDR Custom Monitor Data |
| cut | BPM Studio Cue Points Data |
| cut | CLAN Disambiguation Rules Data |
| cut | GMFC Foam Cutting Data |
| cuts | TS-Doctor Cuts Data |
| cuv | Origin Sample Curve Data |
| cuw | Toyota Calibration Update Wizard Data |
| cv2 | Adobe Audition CV2 Data |
| cva | ACDSee Canvas Sequence Set |
| cvd | Bitdefender Antivirus Database |
| cvd | ClamAV Virus Database |
| cvd | CVTracker Dictionary Data |
| cvf | CPU-Z Validation |
