| ccm | Lotus CC:Mail Mailbox |
| ccm | Multimedia Fusion Custom Menu Data |
| ccmg | STAR-CD v4 Solver Ready Geometry Data |
| ccmp | STAR-CD v4 Results Data |
| ccmt | STAR-CD v4 Transient Data |
| ccp | CloneCD Profile |
| ccp4 | Collaborative Computational Project Number 4 Format Data |
| ccpr | CaptureCAM Pro Data |
| ccr | HealthFrame ASTM Continuity of Care Record |
| ccr | Microsoft SMS Client Configuration Request Data |
| ccrf | Saba Centra Recording Studio Recording |
| ccrz | Saba Centra Recording Studio Recording |
| ccs | TrialDirector Clip Script |
| cct | DesignWorks Schematic Data |
| cct | Live Messenger Contacts Database |
| cct | MicroSim PCBoard Design Information |
| cct | Vector CAD Template |
| ccu | CryptLoad Update Data |
| ccv | SAP Business Objects Crystal Vision Report |
| ccw | Crossword Compiler Crossword File |
| ccwsln | Connected Components Workbench Data |
| ccx | CorelDraw Clipart Data |
| ccz | Client-Course Manager Customized Report Distribution Data |
| cd | STK City Database Main File |
| cd1 | DATAIR Cafeteria Document System Data |
| cd2 | DATAIR Cafeteria Document System Custom Data |
| cda | Giza Specifier Typical Data |
| cdat | Microsoft ISA Server Cache |
| cdb | CardScan Contacts Database |
| cdb | FreeOTFE Key Data |
