| cdx | dBASE Compound Index |
| cdx3 | Cochlear Data Exchange File |
| cea | Compressed ENVIS Archive |
| ced | EEGLAB Channel Data |
| cedata | Pogoplug Data |
| cedf | Ultra TC Configuration Editor Data |
| cee | CN3 Compressed Extended Ephemeris Data |
| cef | QPEACE Cluster Exchange Format Data |
| cef | SanDisk CruzerLock Encrypted Data |
| cef | SciFinder Chemical eXchange Format Data |
| ceh | QPEACE Cluster Exchange Format Header |
| cei | CRiSP Harvest Settings Data |
| ceimg | CeRegEditor Registry Image |
| cekey | McAfee VirusScan Encryption Key Data |
| cel | Affymetrix Probe Array Results File |
| cel | Bentley MicroStation Cell Library |
| cel | PTC Creo Machine Parameter Data |
| cell | CASTEP Cell Input Data |
| celx | Celestia Script File |
| cen | CEN EN 13032 Photometric Data |
| cept | Creative Element Power Tools Data |
| cer | MSI Cerius 2 Format Data |
| cer | Sierra Print Artist Certificate |
| cert | Netscape Certificate Index |
| cetrainer | DBVM Data |
| cev | SEL Compressed Event Report |
| cex | SolidWorks Enterprise PDM Exported Vault Settings |
| cez | Prosurv cEZ Job File |
| cezeokey | CEZEO Product Key Data |
| cf | 1C:Enterprise Configuration Data |
