| cezeokey | CEZEO Product Key Data |
| cf | 1C:Enterprise Configuration 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 Database |
| 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 | 1C:Enterprise Configuration Extension Data |
| cfe | CryptoForge Encrypted |
| cff | Docuware Content Folder File |
| cff2 | Kodak Pandora Exported Data |
| cfgr | BenMAP Configuration Results |
| cfh | Fieldbus Foundation Capabilities Data |
| cfk | Microsoft Developer Studio Diagram |
| cfl | 1C:Enterprise Auxiliary Data |
| cfl | IMVU Product Data |
| cflt | CATS Flat File |
| cfm | Altair FEKO CADFEKO Model Mesh Data |
| cfog | Cloudfogger Encrypted Data |
| cfos6link | cFos IPv6 Link Registration Key |
| cfospnet | cFos Personal Net Registration Key |