| cdf | ANDI/netCDF Chromatography Data |
| cdf-ms | ClickOnce Compiled Manifest |
| cdl | Common Data Form Language File |
| cdm | Sybase PowerDesigner Conceptual Data Model |
| cdmp | WCS Device Model Profile |
| cdoc | DigiDoc Crypted Document |
| cdv | CatDV Catalog |
| cdws | CorelDraw X7 Workspace |
| cdx | dBASE Compound Index |
| cdx3 | Cochlear Data Exchange File |
| ced | EEGLAB Channel Data |
| cel | Affymetrix Probe Array Results File |
| cell | CASTEP Cell Input Data |
| celx | Celestia Script File |
| cen | CEN EN 13032 Photometric Data |
| cex | SolidWorks Enterprise PDM Exported Vault Settings |
| cez | Prosurv cEZ Job File |
| cf | CFEngine Policy Data |
| cf1 | Common Loudspeaker Format Type 1 File |
| 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 File |
| cfd | CryptoForge Document |
| cfdg | Context Free Design Grammar |
| cfe | CryptoForge Encrypted |
| cff | Docuware Content Folder File |
| cfgr | BenMAP Configuration Results |
| cfl | IMVU Product Data |
