| sg4 | Scid Game Database |
| sgb | Songsheet Generator Songbook |
| sgf | Smart Game Format Data |
| sgn | Slax Livecd Signature File |
| sgr | SGR Genome Data |
| sgs | Sansgui Schema Definition File |
| sgt | SPSS Chart Template |
| sgy | SEG-Y Geophysical Data |
| sh3f | Sweet Home 3D Model Library |
| sha | SHA-1 Checksum |
| sha1 | SHA-1 Checksum |
| sha256 | SHA256 Hash Data |
| sha256sum | SHA256 Hash Data |
| sha512 | SHA512 Hash Data |
| shape | Dia Shape File |
| shb | Windows Shell Scrap Object |
| shc | Adobe Photoshop Shape Curves |
| shd | Windows Shadow Header |
| she | Medusa CAD Sheet Data |
| shf | PGP Share Data |
| shft | Shift Work Calendar Data File |
| shh | Adobe Photoshop Shadow and Highlight Data |
| shl | Inno Setup String Tables File |
| shm | Siebel Server Shared Memory File |
| sho | Show Pro Software Show Document |
| shu | SnippetHub Export |
| si2 | SAS Index |
| si3 | ChessDB Index Data |
| si4 | Scid Database Index |
| si7 | SAS Index |
| siard | SIARD Database Archive |
| sic | Intuit Quicken Order Data |
| sic | Sick Submitter Data File |
| sid | Steam Game Backup Data |
| sidb | iTunes Authorization Data File |
