| cef | QPEACE Cluster Exchange Format Data |
| ceh | QPEACE Cluster Exchange Format Header |
| cei | CRiSP Harvest Settings Data |
| ceimg | CeRegEditor Registry Image |
| 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 |
| 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 | CFEngine Policy Data |
| cf1 | Common Loudspeaker Format Type 1 File |
| cf10 | IRIG 106 Original Recording Data |
| cf2 | Common Loudspeaker Format Type 2 File |
| cf3 | CFEngine Policy Data |
| cf5 | Docuware v5 Content Folder File |
| cf7 | Cashflow Manager v7 Data File |
| cf8 | Cashflow Manager v8 Data |
| cf9 | Cashflow Manager v9 Data |
| cfb | Spike2 Filter Bank Data |
| cfbx | Spike2 v7 Filter Bank Data |
| cfd | CryptoForge Document |
| cfdg | Context Free Design Grammar |
| cfe | CryptoForge Encrypted |
| cff | Docuware Content Folder File |
| cfgr | BenMAP Configuration Results |
| cfh | Fieldbus Foundation Capabilities Data |
| cfk | Microsoft Developer Studio Diagram |