| Abbreviation | Definition |
|---|---|
| CRT | Oracle Terminal settings information file |
| CRU | Compressed file archive (CRUSH) |
| CRW | Canon Digital Camera Raw Image Format |
| CRW | CHARTrunner Workspace Definition file |
| CRW | Crossword Genius file |
| CRW | Sandia Software Cadrail Train Terrain Layout file |
| CRX | Links Games Course File |
| CRY | Crypto Chat II Encrypted Notebook - content |
| CRZ | Links Games Course File |
| CS1 | CaptureShop 1-Shot Image file |
| CS3 | Casio WK-1800 Keyboard Output File |
| CS4 | CaptureShop 4-Shot Image file |
| CSA | Comma Delimited Text |
| CSA | InterComm ASCII Sheet File |
| CSA | Ultimate Ride Roller Coaster file |
| CSC | Corel Script |
| CSFS | Cloud Storage File System |
| CSFU | Contract Search File Updated |
| CSG | Statistica/w Graph file |
| CSLM | Bitmap graphics (Zeiss CSLM file) |