| bss | Resident Evil Background Image |
| btb | Warhammer: Dark Omen Map |
| btg | Binary TerraGear Data |
| btl | American Civil War Battle Data |
| bts | Combat Mission Shock Force Saved Scenario |
| btt | Combat Mission Shock Force Scenario |
| bty | Railroad Tycoon 3 Game Data |
| bun | The Dig Game Data |
| bus | VirtualBus Board Parameters File |
| bwd | Colin McRae Rally 2 Car Description File |
| bwe | Black and White 2 Environment Data |
| byml | Super Mario Odyssey Stage Data |
| bzn | Star Trek: Armada Game Map |
| bzw | BZFlag World |
| c3 | Eudemons Online 3D Model |
| c4 | Clonk 4 Script |
| c4b | Clonk Game Data |
| c4f | Clonk Game Round Data |
| c4g | OpenClonk Game System Data |
| c4i | Clonk Game Object 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 |
