| sfr | Mail.dat Special Fees File |
| sfr | MODFLOW Streamflow-Routing Package |
| sfrm | Bruker SFRM Data |
| sfrom | SNES Nintendo Switch Online Rom Image |
| sft | Microsoft App-V Application |
| sft2 | Vegas Pro Custom Rendering Template |
| sftdde | Microsoft App-V Application Data |
| sfx | StatGraphics Centurion Data |
| sfxs | SFXR JSON Export Data |
| sg | SciGraphica Data |
| sg2 | SEG-2 Data File |
| sg3 | ChessDB Game Data |
| sg3 | WinDS PRO SGS Data |
| sg4 | Scid Game Database |
| sgb | Songsheet Generator Songbook |
| sgcap | Case CATalyst Caption Data |
| sgcpo | Case CATalyst Data |
| sgd | SpectraGryph Data |
| sgdct | Case CATalyst Dictionary Data |
| sgf | Smart Game Format Data |
| sgm | VisualBoy Advance Saved Game |
| sgm | XMetaL SGML Data |
| sgmac | Case CATalyst License 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 |
| sgr | S-PLUS Saved Graph Sheet |
| sgr | SGR Genome Data |
