| 1. | .sd | Sound (Entropic Sound Data format) ◊ Sound (Sound Designer I audio file) |
| 2. | .sd2 | SAS database ◊ Sound (Sound Designer II data fork) |
| 3. | .sda | Software Distribution Network file archive description |
| 4. | .sdb | Symbol database (Synopsys Design Compiler) |
| 5. | .sdc | Spreadsheet (StarOffice StarCalc) |
| 6. | .sdd | Presentation file (StarOffice StarImpress) |
| 7. | .sdf | Source definition file (Sourcer) ◊ System Data Format file (legacy Unisys (Sperry) fixed length ASCII text format) |
| 8. | .sdi | Software Distribution Network Info file |
| 9. | .sdk | Disk Image (Roland S-550/S-50/W-30) |
| 10. | .sdl | Library (SmartDraw) ◊ Parsys hardware network description file ◊ Scene Description Language (Alias Wavefront) |
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