| sdox | sharpDox Document |
| sdp | StarOffice Packed Presentation |
| sdr | SmartDraw Drawing |
| sdt | SmartDraw Template |
| sdw | Lotus Word Pro Drawing |
| StarOffice Writer Document |
| sdxml | SimpleDiagrams Diagram Document |
| secure | Septium Secure Document |
| seml | Sealed EML Document |
| sequ | Adobe Acrobat Batch Sequence |
| sew | SLIM‐Estimate Workbook |
| sfd | MagicScore Maestro Score |
| sfx | Shark FX Drawing |
| sg | Micrografx ABC SnapGraphics Document |
| sgi | Sealed GIF Image |
| sgl | StarWriter 5.x Global Document |
| sgm | Standard Generalized Markup Language Document |
| sgml | Standard Generalized Markup Language Document |
| sgo | Silicon Graphics Object File |
| sh3 | Harvard Graphics 3.0 Show Presentation |
| sh3d | Sweet Home 3D Design |
| shg | Segmented Hypergraphic Document |
| show | Hancom Office Hanshow Presentation |
| Hanshow Presentation Document |
| sht | HTML Document with SSI |
| shtm | HTML Document with SSI |
| shtml | HTML Document with SSI |
| shv | Husqvarna Viking SHV Embroidery |
| shw | Corel Presentations Document |
| sia | Silo 3D Model |
| siag | Siag Spreadsheet Document |
| sib | Sibelius Music Notation |
| sif | Autodesk Fabrication Status Import File |
| sig | Broderbund PrintMaster Poster |
| GPG/PGP Signature |
| sil | Silhouette Designer Document |
| sjis | Shift JIS Encoded File |
| sk | Slovak Language Info File |
| sk2 | ACD/ChemSketch Drawing Document |
| skchr | SketchChair Design |
| skd | Autodesk AutoSketch Drawing |
| sketch | Sketch Drawing Document |
| skg | Skrooge Document |
| skin | Help and Manual Viewer Template |
| skk | SmartSketch Drawing |
| skl | XLIFF Skeleton File |
| skt | WinSketch Pro Diagram |
| sktz | Sony Sketch Drawing |
| skv | Semicolon Separated Values |
| skw | SideKick Write Document |
| skwrite | SideKick Write Document |
| sky | Microsoft Multiplan SYLK Spreadsheet |
| sl1 | Articulate Storyline Document |
| sla | Scribus Document |
| slb | Autodesk AutoCAD Slide Library |
| sld | Autodesk AutoCAD Slide Library |
| sld3 | Microsoft PowerPoint 3 for Mac Slide Document |
| sld8 | Microsoft PowerPoint 98 for Mac Slide Document |
| sldbndtbt | SolidWorks Bend Table Template |
| sldbomtbt | SolidWorks Bill of Materials Template |
| slddot | SolidWorks Sheet Template |
| slddraw | SolidWorks Drawing Document |
| slddrt | SolidWorks Sheet Document |
| slddrw | SolidWorks Drawing Document |
| slddwg | SolidWorks 2D Vector Drawing |
| sldfvt | SolidWorks Favorite |
| sldm | Microsoft PowerPoint 2007 Slide |
| slds | Microsoft PowerPoint 2 for Mac Slide Document |
| sldtbt | SolidWorks General Table Template |
| sldx | Microsoft PowerPoint 2007 Slide |
| sldxml | SolidWorks 3DEXPERIENCE XML Document |
| sls3 | Microsoft Excel 3 for Mac Template |
| sls4 | Microsoft Excel 4 for Mac Template |
| sls5 | Microsoft Excel 5 for Mac Template |
| sls8 | Microsoft Excel 98 for Mac Template |
| slt | Senlab Template |
| Shark LT Drawing |
| slvs | SolveSpace Document |
| sly | GNU Lilypond Document |
| sm | Samna Word Text Document |
