| Extension | File Description |
| .FBG | Uncommon Files |
| .FBH | Uncommon Files |
| .FBI | Uncommon Files |
| .FBJ | Uncommon Files |
| .FBK | Backup Files |
| .FBL | GIS Files |
| .FBLZ | Uncommon Files |
| .FBM | Raster Image Files |
| .FBN | Uncommon Files |
| .FBO | Uncommon Files |
| .FBOPTS | Uncommon Files |
| .FBP | Uncommon Files |
| .FBP3 | Uncommon Files |
| .FBP4 | Uncommon Files |
| .FBQ | Uncommon Files |
| .FBR | Video Files |
| .FBS | Uncommon Files |
| .FBT | Uncommon Files |
| .FBU | Backup Files |
| .FBV | Uncommon Files |
| .FBW | Backup Files |
| .FBWINS | Uncommon Files |
| .FBX | 3D Image Files |
| .FBY | Uncommon Files |
| .FBZ | Uncommon Files |
| .FBZ3 | Uncommon Files |
| .FBZ4 | Uncommon Files |
| .FC | Uncommon Files |
| .FC$ | Uncommon Files |
| .FC0 | Uncommon Files |
| .FC1 | Uncommon Files |
| .FC2 | 3D Image Files |
| .FC3 | Uncommon Files |
| .FC4 | Uncommon Files |
| .FC5 | Uncommon Files |
| .FC6 | Uncommon Files |
| .FC7 | Uncommon Files |
| .FC8 | Uncommon Files |
| .FC9 | Uncommon Files |
| .FCA | Uncommon Files |
| .FCB | Uncommon Files |
| .FCC | Settings Files |
| .FCD | Database Files |
| .FCDT | Page Layout Files |
| .FCE | Developer Files |
| .FCF | Text Files |
| .FCG | Uncommon Files |
| .FCGI | Web Files |
| .FCH | Uncommon Files |
| .FCHK | Uncommon Files |
| .FCI | Uncommon Files |
| .FCJ | Uncommon Files |
| .FCK | Uncommon Files |
| .FCL | Developer Files |
| .FCM | Game Files |
| .FCN | Uncommon Files |
| .FCO | Uncommon Files |
| .FCP | Video Files |
| .FCQ | Uncommon Files |
| .FCR | Uncommon Files |
| .FCS | Spreadsheet Files |
| .FCT | Data Files |
| .FCU | Uncommon Files |
| .FCV | Uncommon Files |
| .FCW | CAD Files |
| .FCX | Uncommon Files |
| .FCY | Uncommon Files |
| .FCZ | Uncommon Files |
| .FD | Developer Files |
| .FD0 | Uncommon Files |
| .FD1 | Uncommon Files |
| .FD2 | Uncommon Files |
| .FD3 | Uncommon Files |
| .FD4 | Uncommon Files |
| .FD5 | Uncommon Files |
| Extension | File Description |
| .FD6 | Uncommon Files |
| .FD7 | Uncommon Files |
| .FD8 | Uncommon Files |
| .FD9 | Uncommon Files |
| .FDA | Audio Files |
| .FDAT | Uncommon Files |
| .FDB | Data Files |
| .FDC | Settings Files |
| .FDD | Page Layout Files |
| .FDE | Uncommon Files |
| .FDF | Text Files |
| .FDG | Uncommon Files |
| .FDH | Uncommon Files |
| .FDI | Disk Image Files |
| .FDJ | Uncommon Files |
| .FDK | Uncommon Files |
| .FDL | Uncommon Files |
| .FDM | Data Files |
| .FDN | Uncommon Files |
| .FDO | Uncommon Files |
| .FDP | Compressed Files |
| .FDPART | Uncommon Files |
| .FDQ | Uncommon Files |
| .FDR | Text Files |
| .FDS | GIS Files |
| .FDT | Text Files |
| .FDU | Uncommon Files |
| .FDV | Uncommon Files |
| .FDW | Uncommon Files |
| .FDX | Text Files |
| .FDY | Uncommon Files |
| .FDZ | Uncommon Files |
| .FE0 | Uncommon Files |
| .FE1 | Uncommon Files |
| .FE2 | Uncommon Files |
| .FE3 | Uncommon Files |
| .FE4 | Uncommon Files |
| .FE5 | Uncommon Files |
| .FE6 | Uncommon Files |
| .FE7 | Uncommon Files |
| .FE8 | Uncommon Files |
| .FE9 | Uncommon Files |
| .FEA | Uncommon Files |
| .FEATURES | Uncommon Files |
| .FEB | Uncommon Files |
| .FEB94 | Uncommon Files |
| .FEC | Uncommon Files |
| .FED | Uncommon Files |
| .FEE | Uncommon Files |
| .FEED | Uncommon Files |
| .FEEL | Uncommon Files |
| .FEF | Uncommon Files |
| .FEG | Uncommon Files |
| .FEH | Uncommon Files |
| .FEI | Uncommon Files |
| .FEJ | Uncommon Files |
| .FEK | Uncommon Files |
| .FEL | Uncommon Files |
| .FEM | Uncommon Files |
| .FEN | Uncommon Files |
| .FENDER | Uncommon Files |
| .FENETRE | Uncommon Files |
| .FEO | Uncommon Files |
| .FEP | Uncommon Files |
| .FEQ | Uncommon Files |
| .FER | Uncommon Files |
| .FES | Data Files |
| .FET | Uncommon Files |
| .FEU | Uncommon Files |
| .FEV | Settings Files |
| .FEW | Uncommon Files |
| .FEX | Uncommon Files |
| .FEY | Uncommon Files |
| .FEZ | Uncommon Files |
| .FE_LAUNCH | Data Files |
