| cqx | Cool Quiz Data |
| cqz | Cool Quiz Data |
| cr0 | Autodesk Moldflow Cool Analysis Restart File |
| cr2 | Poser Character |
| cr3 | Casio WK-1800 Registration Data |
| cr4 | STABCAL Calculation Data |
| cram | CRAM Data |
| crash | Steam Crash Data |
| crashed | AbiWord Crash-Saved Document |
| crate | Serato DJ Crate Data |
| crc | PTC Creo Circular Reference Data |
| Total Commander CRC Checksum |
| crc32 | CRC32 Checksum |
| crd | CARE-S InfoWorks Catchment Runoff Data |
| Carlson 2016 Coordinate Data |
| CHARTrunner Dashboard |
| MODELLER Atom Coordinates CHARMM Data |
| crdb | Carlson 2016 Coordinate Database |
| crds | Windows CardSpace Backup |
| creole | Creole Source Code |
| crf | Cal3D Binary Materials Data |
| MOUSE Runoff Data |
| Sierra Print Artist Craft Data |
| crg | OpenCRG Data File |
| cri | PLS-CADD Criteria |
| WaterGEMS Criticality Analysis Results Data |
| crl | Certificate Revocation List |
| crld | Clicker Crick Resource Library Data |
| crm | WRAP Conditional Reliability Modeling Data |
| crmlog | Microsoft Windows COM+ CRM Log |
| cro | AquaCrop Crop Data |
| CropWat Data |
| crossdb | MixVibes Cross DJ Collection Data |
| crossmedia | MixVibes Cross DJ Media Data |
| crp | MSI SecureDoc Encrypted Data |
| crpd | Microsoft Windows SignTool Data |
| crpt | Cryptosaurus Encrypted File |
| crq | Blackboard Course Requests |
| crr | Cgatools CRR File |
| SVAL Correction Data |
| crs | CompuTrainer Chart Screen |
| Corel WordPerfect Conversion Resource Data |
| Document Conversion Resource |
| crs3 | OmniPage Lite Data |
| crt | Oracle Terminal Settings Information |
| crtx | Microsoft Excel 2007 Custom Chart Template |
| crv | ANSYS TurboGrid Curve File |
| Corel Photo-Paint Custom Gradients Data |
| Daqarta Curve Data |
| Programmable Curves Data |
| crw | CHARTrunner Workspace |
| Crossword Genius Crossword Puzzle Data |
| crwl | Windows Search Crawl Data |
| crypt | WhatsApp Stored Messages |
| crypt1 | WhatsApp Encrypted Database |
| WhatsApp Stored Messages |
| crypt10 | WhatsApp Stored Messages |
| crypt11 | WhatsApp Stored Messages |
| crypt12 | WhatsApp Stored Messages |
| crypt14 | WhatsApp Encrypted Database |
| crypt15 | WhatsApp Encrypted Database |
| crypt2 | WhatsApp Stored Messages |
| crypt3 | WhatsApp Stored Messages |
| crypt4 | WhatsApp Stored Messages |
| crypt5 | WhatsApp Stored Messages |
| crypt6 | WhatsApp Stored Messages |
| crypt7 | WhatsApp Stored Messages |
| crypt8 | WhatsApp Stored Messages |
| crypt9 | WhatsApp Stored Messages |
| crypted | Ashampoo WinOptimizer Encrypted Data |
| crypto | Encrypto Encrypted File |
| cryptra | Cryptra One Time Pad Encrypted File |
| crz | FScruiser Cruise Record Data |
| Poser Compressed Character |
| cs | Adobe Encore Color Set |
| ClearSilver Template File |
| ColorSchemer Studio Color Scheme |
| JCAMP Chemical Structure Data |
| Torque 3D Game Engine Script |
| cs3 | Casio WK-1800 Song Sequencer Data |
