| Abbreviation | Definition |
|---|---|
| SCY | ReaGeniX Security file |
| SCZ | Wingz Data file |
| SD | Entropic Sound Sound Data format |
| SDA | Software Distribution Network file archive description |
| SDF | Source Definition File |
| SDF | System Data Format file (Fixed-length ASCII Text) |
| SDI | Software Distribution Network Info file |
| SDK | Roland S-550/S-50/W-30 Disk Image |
| SDL | Parsys hardware network description file |
| SDL | Scene Description Language (Alias Wavefront) |
| SDL | SmartDraw library |
| SDML | Spacial Data Modeling Language |
| SDN | Software Distribution Network compressed file archive |
| SDR | SmartDraw drawing |
| SDR | Sounder system Music |
| SDS | MIDI Sample DUMP Standard File |
| SDT | SmartDraw template |
| SDTS | Spatial Data Transfer Standard |
| SDW | Ami Draw Vector graphics |
| SDX | Sample DUMP Exchange File |