| 1. | .sg | Image file (SnapGraphix) |
| 2. | .sg1 | Graphics (Stanford Graphics) |
| 3. | .sgd | Help file (Lahey Blackbeard) |
| 4. | .sgf | Document with graphics (Starwriter) ◊ Graphics file (Sonique) |
| 5. | .sgi | Bitmap graphics (Irix RGB image format) |
| 6. | .sgm | IETF SGML document (Standard Generalized Markup Language) |
| 7. | .sgml | IETF SGML document (Standard Generalized Markup Language) |
| 8. | .sgp | Statistics (STATGRAPHICS Plus) |
| 9. | .sgt | Save/get keyboard macro (Signature) ◊ Segment (DirectMusic) |
| 10. | .sgx | Help file index (Lahey Fortran) |
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