| sg | Sega SG-1000 Image |
| sg2 | SEG-2 Data File |
| sg3 | ChessDB Game Data |
| sg3 | WinDS PRO SGS Data |
| sg4 | Scid Game Database |
| sga | SEG-A Seismic Data |
| sgb | SEG-B Seismic Data |
| sgb | Songsheet Generator Songbook |
| sgcap | Case CATalyst Caption Data |
| sgcdb | Case CATalyst Conflict Database |
| sgcpo | Case CATalyst Data |
| sgcul | Case CATalyst User Layout Data |
| sgcvn | Case CATalyst CaseViewNet Document |
| sgd | SEG-D Data |
| sgd | SpectraGryph Data |
| sgdct | Case CATalyst Dictionary Data |
| sgezt | Case CATalyst EZ Text Table |
| sgf | Smart Game Format Data |
| sgg | Statgraphics Plus StatGallery Data |
| sgglb | Case CATalyst Global Table |
| sgkbd | Case CATalyst Keyboard Map Data |
| sglog | Case CATalyst Log Data |
| sgm | VisualBoy Advance Saved Game |
| sgm | XMetaL SGML Data |
| sgmac | Case CATalyst Macro Data |
| sgn | Sierra Print Artist Sign Data |
| sgn | Slax Livecd Signature File |
| sgngl | Case CATalyst Text Data |
| sgo | SansGUI Object Library |
| sgp | SansGUI Project Model |
| sgp | Sitestepper Data |
| sgp | Statgraphics Plus Statistics Data |
| sgpgb | Case CATalyst Personal Global Table |
| sgpgl | Case CATalyst Layout Data |
| sgphn | Case CATalyst Phonetic Data |
