| sdf | Iconics GraphWorx32 Symbol Library |
| sdfa | Exocad 3D Model |
| sdl | Scene Description Language Document |
| sdl | Web Services Description Language Document |
| sdm | StarOffice Mail Document |
| sdn | Steel Detail Neutral File |
| sdnf | Steel Detail Neutral File |
| sdoc | Sealed Word Document |
| sdocm | Sealed Word 2007 Document without Macros |
| sdocx | Sealed Word 2007 Document |
| sdot | Sealed Word Template |
| sdotm | Sealed Word 2007 Template without Macros |
| sdotx | Sealed Word 2007 Template |
| sdp | StarOffice Packed Presentation |
| sdr | SmartDraw Drawing |
| sdt | SmartDraw Template |
| sdw | StarOffice Writer Document |
| secure | Septium Secure Document |
| seml | Sealed EML Document |
| sequ | Adobe Acrobat Batch Sequence |
| sg | Micrografx ABC SnapGraphics Document |
| 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 | Hanshow Presentation Document |
| sht | HTML Document with SSI |
