| smtp | Pegasus Mail SMTP Session Log |
| smv | Cadence SMV Data |
| smv | Smokeview Simulation Data |
| smv | Snes9x Captured Video |
| smx | SmartMusic XML Data |
| smx | STATISTICA Matrix File |
| smx | SysMetrix Skin |
| smxx | Autodesk Revit Exchange Data |
| smz | IBM SPSS Graphboard Template Chooser Shape |
| sn | Elnec Programmer Serialization File |
| sn1 | Drive Snapshot Backup Data |
| sn2 | Drive Snapshot Backup Data |
| sn3 | ChessDB Name Data |
| sn3 | Drive Snapshot Backup Data |
| sn4 | Drive Snapshot Backup Data |
| sn4 | Scid Name Data |
| sn5 | Drive Snapshot Backup Data |
| sn6 | Drive Snapshot Backup Data |
| sn7 | Drive Snapshot Backup Data |
| sn8 | Drive Snapshot Backup Data |
| sn9 | Drive Snapshot Backup Data |
| sna | Drive Snapshot Backup Data |
| sna | ZX Spectrum Emulator Snapshot |
| snag | SnagIt Capture File |
| snagacc | SnagIt Accessory Installer Data |
| snagitstamps | SnagIt Stamp Archive |
| snagstyles | SnagIt Style Archive |
| snagtheme | SnagIt Theme Archive |
| snagundo | SnagIt Undo Data |
| snagx | SnagIt 2022 Capture File |
