| cs | Adobe Encore Color Set |
| cs | ClearSilver Template File |
| cs | JCAMP Chemical Structure Data |
| cs3 | Casio WK-1800 Song Sequencer Data |
| cs80v2 | Arturia CS-80V Data |
| csa | Cadstar Schematic Design |
| csac | Web Research Collection Optimization Temporary Data |
| csaplan | SPSS Complex Sample Analysis Plan |
| csar | CARIS Spatial Archive |
| csattr | Chaoscope Attractor Data |
| csb | Corel Binary Script |
| csc | CHARTrunner Control Chart Style |
| csc | Corel Script |
| csc | STK Calculation Scalar File |
| cscft | Colasoft Capsa Features Data |
| cscont | Colasoft Capsa Name Table |
| cscpflt | Colasoft Capsa Project Filter Data |
| cscpkt | Colasoft Capsa 5.0 Packet Data |
| cscpro | Colasoft Capsa Protocol Data |
| cscta | Colasoft Capsa Time Analyze Data |
| csctf | Colasoft Capsa Data |
| csdate | ClickStamper Date Stamp Data |
| csdb | CSPro Database |
| csdf | SPICE Common Simulation Data Format File |
| csdsig | Altaro Oops!Backup Data |
| cset | Cyber Security Evaluation Tool Data |
| csf | SmartWare Data Format Definition |
| csfdb | Open CASCADE 3D Model |
| csgen | ClickStamper Data |
| csh | CARA Script Engine Script |
| csh | CHARTrunner Histogram Style |
| csi | CARE-S InfoWorks Water Quality Data |
| csj | BlackBerry Code Signing Data |
| csk | BlackBerry Code Signing Keys |
| cskin | CD Art Display Skin |
