| cdf | Affymetrix Chip Description File |
| cdf | ECMG Content Definition File |
| cdf | ANDI/netCDF Chromatography Data |
| cdf-ms | ClickOnce Compiled Manifest |
| cdfx | Cindex Data |
| cdl | Common Data Form Language File |
| cdm | Sybase PowerDesigner Conceptual Data Model |
| cdmp | WCS Device Model Profile |
| cdoc | DigiDoc Crypted Document |
| cdrx | Bosch Crash Data Retrieval Data |
| cdv | CatDV Catalog |
| cdws | CorelDraw X7 Workspace |
| cdx | dBASE Compound Index |
| cdx3 | Cochlear Data Exchange File |
| cea | Compressed ENVIS Archive |
| ced | EEGLAB Channel Data |
| cee | CN3 Compressed Extended Ephemeris Data |
| cei | CRiSP Harvest Settings Data |
| cel | Affymetrix Probe Array Results File |
| cell | CASTEP Cell Input Data |
| celx | Celestia Script File |
| cen | CEN EN 13032 Photometric Data |
| cert | Netscape Certificate Index |
| 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 |
| cf9 | Cashflow Manager v9 Data |
| cfd | CryptoForge Document |
| cfdg | Context Free Design Grammar |
