| s2d | ADS S-parameter Data |
| s2p | EEsof Touchstone File |
| s2t | Scia Engineer to Tekla Converter Data |
| s31 | SmartWhois Data |
| s32 | Motorola S-record Data |
| s3c | ContextCapture 3D Model Data |
| s3d | Shout3D 3D Scene |
| s3d | Simple 3D Object |
| s3db | SQLite 3 Database |
| s3p | EEsof Touchstone File |
| s4d | RIAM AVA Motion S4D Data |
| s4p | EEsof Touchstone File |
| s4pb | Nokia 108 Phonebook Data |
| s7d | Sony Ericsson S700i Phone Default Language |
| s7m | SAS Data Mining Database |
| s7s | Sony Ericsson S700i Phone Firmware |
| s8 | SIMUL8 Simulation |
| s8theme | Start8 Theme Data |
| s99 | MicroStation Modification Site Resource File |
| sa2 | SAS Access Descriptor |
| sa3 | WinDS PRO Data |
| sa4 | STABCAL Data |
| sa7 | SAS Access Descriptor |
| sab | Standard ACIS Binary |
| sab2 | NVision 3D Scanner Data |
| sac | IRIS SAC File |
| sad | Windows Server Security Association Database |
| sae | Sage Accountant Link |
| saff | SuperStream Alternative File Format Data |
| sah | SETI@home Data |
| sai | Burrows-Wheeler Alignment Tool SAI Data |
| saj | Sage 50 Folder Data |
| sapssd | SAP GUI Data |
| sas7bacs | SAS Access Descriptor |
| sas7baud | SAS Audit Data |