| Extension | File Description |
| .FORMAT | Uncommon Files |
| .FORMATTER | Uncommon Files |
| .FORMS | Uncommon Files |
| .FORREVIEW | Uncommon Files |
| .FORTH | Uncommon Files |
| .FORUM | Uncommon Files |
| .FOS | Game Files |
| .FOT | Font Files |
| .FOU | Uncommon Files |
| .FOUNDATION | Uncommon Files |
| .FOUR | Uncommon Files |
| .FOV | Uncommon Files |
| .FOW | Uncommon Files |
| .FOX | Data Files |
| .FOY | Uncommon Files |
| .FOZ | Uncommon Files |
| .FP | Spreadsheet Files |
| .FP0 | Uncommon Files |
| .FP1 | Uncommon Files |
| .FP2 | Uncommon Files |
| .FP3 | 3D Image Files |
| .FP4 | Uncommon Files |
| .FP5 | Database Files |
| .FP6 | Uncommon Files |
| .FP7 | Database Files |
| .FP8 | Uncommon Files |
| .FP9 | Uncommon Files |
| .FPA | Data Files |
| .FPB | Uncommon Files |
| .FPBF | System Files |
| .FPC | Uncommon Files |
| .FPD | CAD Files |
| .FPE | 3D Image Files |
| .FPF | 3D Image Files |
| .FPG | Raster Image Files |
| .FPH | Uncommon Files |
| .FPHTML | Uncommon Files |
| .FPI | Executable Files |
| .FPIX | Uncommon Files |
| .FPJ | Uncommon Files |
| .FPK | Misc Files |
| .FPL | Uncommon Files |
| .FPM | Developer Files |
| .FPN | Uncommon Files |
| .FPO | Uncommon Files |
| .FPP | Uncommon Files |
| .FPQ | Uncommon Files |
| .FPR | Uncommon Files |
| .FPS | Game Files |
| .FPT | Text Files |
| .FPU | Uncommon Files |
| .FPV | Uncommon Files |
| .FPVERS | Uncommon Files |
| .FPW | Uncommon Files |
| .FPWEB | Uncommon Files |
| .FPX | Raster Image Files |
| .FPY | Uncommon Files |
| .FPZ | Uncommon Files |
| .FQ0 | Uncommon Files |
| .FQ1 | Uncommon Files |
| .FQ2 | Uncommon Files |
| .FQ3 | Uncommon Files |
| .FQ4 | Uncommon Files |
| .FQ5 | Uncommon Files |
| .FQ6 | Uncommon Files |
| .FQ7 | Uncommon Files |
| .FQ8 | Uncommon Files |
| .FQ9 | Uncommon Files |
| .FQA | Uncommon Files |
| .FQB | Uncommon Files |
| .FQC | Uncommon Files |
| .FQD | Uncommon Files |
| .FQE | Uncommon Files |
| .FQF | Uncommon Files |
| .FQG | Uncommon Files |
| Extension | File Description |
| .FQH | Uncommon Files |
| .FQI | Uncommon Files |
| .FQJ | Uncommon Files |
| .FQK | Uncommon Files |
| .FQL | Uncommon Files |
| .FQM | Uncommon Files |
| .FQN | Uncommon Files |
| .FQO | Uncommon Files |
| .FQP | Uncommon Files |
| .FQQ | Uncommon Files |
| .FQR | Uncommon Files |
| .FQS | Uncommon Files |
| .FQT | Uncommon Files |
| .FQU | Uncommon Files |
| .FQV | Uncommon Files |
| .FQW | Uncommon Files |
| .FQX | Uncommon Files |
| .FQY | Uncommon Files |
| .FQZ | Uncommon Files |
| .FR | Uncommon Files |
| .FR0 | Uncommon Files |
| .FR1 | Uncommon Files |
| .FR2 | Uncommon Files |
| .FR3 | Page Layout Files |
| .FR4 | Uncommon Files |
| .FR5 | Uncommon Files |
| .FR6 | Uncommon Files |
| .FR7 | Uncommon Files |
| .FR8 | Uncommon Files |
| .FR9 | Uncommon Files |
| .FRA | Uncommon Files |
| .FRACT | Uncommon Files |
| .FRAME | Uncommon Files |
| .FRAME5 | Uncommon Files |
| .FRAMES | Uncommon Files |
| .FRB | Uncommon Files |
| .FRC | Game Files |
| .FRD | Uncommon Files |
| .FRE | Uncommon Files |
| .FREC | Uncommon Files |
| .FREECELLSA | Uncommon Files |
| .FREEGUITAR | Uncommon Files |
| .FREESIDEFN | Uncommon Files |
| .FREQ | Uncommon Files |
| .FRF | Page Layout Files |
| .FRG | Audio Files |
| .FRH | Uncommon Files |
| .FRI | Uncommon Files |
| .FRJ | Uncommon Files |
| .FRK | Misc Files |
| .FRL | Data Files |
| .FRM | Data Files |
| .FRN | Uncommon Files |
| .FRO | Data Files |
| .FRONT242 | Uncommon Files |
| .FRONT_242_ | Uncommon Files |
| .FRP | Uncommon Files |
| .FRQ | Uncommon Files |
| .FRR | Uncommon Files |
| .FRS | Executable Files |
| .FRT | Text Files |
| .FRU | Uncommon Files |
| .FRV | Uncommon Files |
| .FRW | Uncommon Files |
| .FRX | Developer Files |
| .FRY | Uncommon Files |
| .FRZ | Misc Files |
| .FS | Vector Image Files |
| .FS0 | Uncommon Files |
| .FS1 | Uncommon Files |
| .FS2 | Game Files |
| .FS3 | Uncommon Files |
| .FS4 | Uncommon Files |
| .FS5 | Uncommon Files |
| .FS6 | Uncommon Files |
