| sf | StatGraphics Centurion Data |
| sf | RMCProfile Sulphur and Fluorine Data |
| sf0 | Windows Sytem File Check Data |
| sf1 | Census Bureau Summary File 1 |
| sf2 | SAS Consolidation Database |
| sf3 | StatGraphics Centurion Data |
| sf6 | StatGraphics Centurion Data |
| sf7 | SAS Consolidation Database |
| sfap0 | Sound Forge Audio Proxy |
| sfarr | SynthFont Arrangement Data |
| sfc | SNES ROM Image SMC |
| sfcache | Microsoft Windows ReadyBoost File |
| sfd-hdstx | Hydrostatix Master Suite Data |
| sfera | Sfera 360 File |
| sff | SmartWare Screen Font Data |
| sff | WRAP Storage-Flow-Frequency Data |
| sfh | BESA MRI Surface Points Data |
| sfj | TeamForge Journal Data |
| sfl | Verity Server Standard Fields File |
| sfm | DartPro 98 Audio Tree |
| sfo | CuteFTP Search |
| sfp | System File Protection Database |
| 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 |
| sfx | StatGraphics Centurion Data |
| sg2 | SEG-2 Data File |
| sg3 | ChessDB Game Data |
| sg4 | Scid Game Database |
| sgb | Songsheet Generator Songbook |
| sgcap | Case CATalyst Caption Data |
| sgcpo | Case CATalyst Data |