| csd | Steam Client Game Backup Data |
| csdate | ClickStamper Date Stamp Data |
| csdb | CSPro Database |
| csdf | SPICE Common Simulation Data Format File |
| csdsig | Altaro Oops!Backup Data |
| cse | Web Research Document Package |
| cset | Cyber Security Evaluation Tool Data |
| csf | Cal3D Binary Skeleton Data |
| csf | SmartWare Data Format Definition |
| csf | VanDyke SecureCRT Script |
| csfdb | Open CASCADE 3D Model |
| csgen | ClickStamper Data |
| csh | CARA Script Engine Script |
| csh | CHARTrunner Histogram Style |
| csh | Cubase Waveform Audio Data |
| csi | CARE-S InfoWorks Water Quality Data |
| csi | Microsoft SharePoint Server 2007 Temporary Data |
| csj | BlackBerry Code Signing Data |
| csk | BlackBerry Code Signing Keys |
| csk | Copernic 2001 Skin Data |
| cskin | CD Art Display Skin |
| csl | CorelDraw Symbol Library |
| csm | 3ds Max Character Studio Marker Data |
| csm | Chemical Style Markup Language Data |
| csm | Mail.dat Container Summary File |
| csm | Steam Client Game Backup Data |
| csml | Chemical Style Markup Language Data |
| csmo | Free College Schedule Maker Data |
| csn | CopyMate Raw Points Cloud Scan Data |
| csn | Race Studio 2 Custom Sensors Data |
