| ffwp | FormsForWeb Filler Formula Data |
| fg3 | FX Graph 3 Document |
| fg5 | OASYS GraphPro Document |
| fgc | Greeting Card Factory Card |
| fhe | Singer Futura Embroidery Design |
| fig | Xfig Document |
| filt | 4D Database for Mac ASCII Table Data |
| fkt | KmPlot Document |
| flag | FlagMaker Document |
| flo | iGrafx FlowCharter Document |
| flowchart | PureFlow Flowchart |
| flw | Kivio Flowchart Document |
| fly | GNU Lilypond Document |
| fm | Adobe FrameMaker Document |
| fm1 | Lotus 1-2-3 V2 Spreadsheet |
| fm2 | Lotus 1-2-3 Worksheet Formatting Data |
| fm3 | Lotus 1-2-3 Worksheet Formatting Data |
| fmc | COBUS NCAD Document |
| fme | FME Document |
| fmt | Lotus 1-2-3 Worksheet Formatting Data |
| fmt | Microsoft Schedule Plus Print |
| fmv | Frame Vector Metafile |
| fnf | FORTE Notation Document |
| fnf | PTC Creo FEM Neutral Format Document |
| fns | Free Notes Document |
| fo | XSL-FO Formatted Form |
| fodg | OpenDocument Flat XML Graphics |
| fodp | OpenDocument Flat XML Presentation |
| fods | OpenDocument Flat XML Spreadsheet |
| fodt | OpenDocument Flat XML Document |
| folio | Adobe DPS Folio File |
| fopx | Microsoft Organization Chart for Mac Document |
| fountain | Fountain Script File |
| fp | FileMaker Pro Document |
| fpage | Microsoft XPS Fixed Page Document |
