| serverdef | Eclipse WTP Server Definition Data |
| ses | Adobe Audition v2 Session |
| ses | SPECCTRA Session File |
| sess | PHP Session Data |
| sesx | Adobe Audition Session |
| set | PLINK END-terminated Variant Set Membership List |
| settingcontent-ms | Microsoft Windows 10 Settings Data |
| sev | Sevilla Tournament Data |
| sevz | Sevilla Compressed Tournament Data |
| sew | Janome Stitch-based Embroidery Data |
| sez | SEEP/W ZIP Compressed Data |
| sf | StatGraphics Centurion Data |
| sf | RMCProfile Sulphur and Fluorine Data |
| sf0 | Windows Sytem File Check Data |
| sf1 | Census Bureau Summary File 1 |
| sf2 | SAS Consolidation Database |
| sf3 | StatGraphics Centurion Data |
| sf6 | StatGraphics Centurion Data |
| sf7 | SAS Consolidation Database |
| sfap0 | Sound Forge Audio Proxy |
| sfarr | SynthFont Arrangement Data |
| sfc | SNES ROM Image SMC |
| sfcache | Microsoft Windows ReadyBoost File |
| sfd-hdstx | Hydrostatix Master Suite Data |
| sfera | Sfera 360 File |
| sff | SmartWare Screen Font Data |
| sff | WRAP Storage-Flow-Frequency Data |
| sfh | BESA MRI Surface Points Data |
| sfj | TeamForge Journal Data |
| sfl | Verity Server Standard Fields File |
