| ses | SciTE Session Data |
| ses | Shadow Security Scanner Session Data |
| ses | SPECCTRA Session File |
| ses | Zemax Session Data |
| sess | PHP Session Data |
| session | Mozilla Firefox Session Data |
| sesx | Adobe Audition Session |
| set | 3WayPack Set Data |
| set | BPM Studio Encrypted User Information |
| set | Corel Painter Settings Data |
| set | Mastercam Setup Sheet Template |
| set | Nikon Capture Settings Data |
| set | PLINK END-terminated Variant Set Membership List |
| set | Raynen-Qili KnitCAD Pattern Expansion Data |
| set | Sibelius Sound Set Definition |
| settingcontent-ms | Microsoft Windows 10 Settings Data |
| setup | TD Setup Data |
| sev | Sevilla Tournament Data |
| sevz | Sevilla Compressed Tournament Data |
| sew | Carlson 2016 Sewer Network Data |
| sew | Janome Stitch-based Embroidery Data |
| sez | SEEP/W ZIP Compressed Data |
| sf | Cognos Powerhouse Subfile Data |
| sf | Fire Dynamics Simulator Slice Data |
| sf | RMCProfile Sulphur and Fluorine Data |
| sf | StatGraphics Centurion Data |
| sf0 | Windows Sytem File Check Data |
| sf1 | Census Bureau Summary File 1 |
| sf2 | SAS Consolidation Database |
| sf3 | StatGraphics Centurion Data |
| sf3 | Statgraphics Data |
| sf6 | StatGraphics Centurion Data |
| sf6 | Statgraphics Data |
| sf7 | SAS Consolidation Database |
| sfa | STAAD Foundation v7 Project |
