| 1. | .si | Graphics (SoftImage) |
| 2. | .sid | C64 tunes and sound effects file (PlaySID) ◊ Graphics (MrSID image format, GIS data for ArcInfo) |
| 3. | .sif | Setup Installation File ◊ Vector data (ISIF format) |
| 4. | .sig | Current program settings (Signature) ◊ Detached signature file (Pretty Good Privacy) ◊ Signature file (ThunderByte AntiVirus - PopMail) ◊ A .sig file can be set up and automatically … 0.4 KB |
| 5. | .sik | Backup file (Sicherungskopie) (Microsoft Word) |
| 6. | .silo | Mesh file (MeshTV) |
| 7. | .sim | SIMPLE script source (Telix) |
| 8. | .sir | Bitmap graphics (Solitaire file) |
| 9. | .sis | Software installation file (EPOC Install) |
| 10. | .sit | Compressed Macintosh file archive (Stuffit) |
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