| 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 |
| sfxs | SFXR JSON Export 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 |
| sgdct | Case CATalyst Dictionary Data |
| sgf | Smart Game Format Data |
| sgmac | Case CATalyst License Data |
| sgn | Slax Livecd Signature File |
| sgngl | Case CATalyst Text Data |
| sgr | SGR Genome Data |
| sgs | Sansgui Schema Definition File |
| sgstn | Case CATalyst Steno Note Data |