| c3 | Eudemons Online 3D Model |
| c4 | Clonk 4 Script |
| c4b | Clonk Game Data |
| c4g | OpenClonk Game System Data |
| c4k | Clonk Game Key |
| c4s | Clonk Game Scenario |
| c4u | OpenClonk Update System Data |
| c4v | Clonk Game Video |
| ca2 | Forza MotorSport Game Data |
| card | Funkiball Adventure Saved Game Data |
| cau | Trespasser Game Audio |
| cba | ChessBase Annotations |
| cbb | ChessBase Search Booster |
| cbc | ChessBase Commentators Index |
| cbd | Test Drive Unlimited Cache Data |
| cbe | ChessBase Team Index |
| cbf | ChessBase Old Game Database |
| cbg | ChessBase Game Moves Data |
| cbgi | ChessBase Second Search Booster |
| cbh | ChessBase Database Header |
| cbi | ChessBase Old Database Index |
| cbj | ChessBase Second Header Data |
| cbm | ChessBase Multimedia Baggage Data |
| cbmap | Containment Breach Map |
| cbp | ChessBase Players Index |
| cbs | ChessBase Source Index |
| cbt | ChessBase Tournament Index |
| cbtt | ChessBase Tutorials Database |
| cbv | ChessBase Archived Database |
| cbz | ChessBase Encrypted Archived Database |
