| 131. | .si | Graphics (SoftImage) |
| 132. | .sid | C64 tunes and sound effects file (PlaySID) ◊ Graphics (MrSID image format, GIS data for ArcInfo) |
| 133. | .sif | Setup Installation File ◊ Vector data (ISIF format) |
| 134. | .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 |
| 135. | .sik | Backup file (Sicherungskopie) (Microsoft Word) |
| 136. | .silo | Mesh file (MeshTV) |
| 137. | .sim | SIMPLE script source (Telix) |
| 138. | .sir | Bitmap graphics (Solitaire file) |
| 139. | .sis | Software installation file (EPOC Install) |
| 140. | .sit | Compressed Macintosh file archive (Stuffit) |
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