| Extension | File Description |
| .BB7 | Uncommon Files |
| .BB8 | Uncommon Files |
| .BB9 | Uncommon Files |
| .BBA | Uncommon Files |
| .BBB | Uncommon Files |
| .BBC | Developer Files |
| .BBD | Uncommon Files |
| .BBE | Uncommon Files |
| .BBF | Uncommon Files |
| .bbg | Uncommon Files |
| .BBH | Uncommon Files |
| .BBI | Uncommon Files |
| .BBJ | Uncommon Files |
| .BBK | Uncommon Files |
| .bbl | Uncommon Files |
| .BBM | Uncommon Files |
| .BBMA | Uncommon Files |
| .BBN | Uncommon Files |
| .BBNNG | Uncommon Files |
| .BBO | Uncommon Files |
| .BBP | Uncommon Files |
| .BBQ | Uncommon Files |
| .BBR | Uncommon Files |
| .BBRKPUZZLE | Uncommon Files |
| .BBRKSAVE | Uncommon Files |
| .BBS | Text Files |
| .BBT | Uncommon Files |
| .BBU | Uncommon Files |
| .BBV | Uncommon Files |
| .BBW | Uncommon Files |
| .BBX | Uncommon Files |
| .BBY | Uncommon Files |
| .BBZ | Uncommon Files |
| .BC | Misc Files |
| .BC! | Misc Files |
| .BC0 | Uncommon Files |
| .BC1 | Uncommon Files |
| .BC2 | Uncommon Files |
| .BC3 | Uncommon Files |
| .BC4 | Uncommon Files |
| .BC5 | Uncommon Files |
| .BC6 | Uncommon Files |
| .BC7 | Uncommon Files |
| .BC8 | Uncommon Files |
| .BC9 | Uncommon Files |
| .BCA | Uncommon Files |
| .BCB | Uncommon Files |
| .BCB3 | Uncommon Files |
| .BCC | Data Files |
| .BCD | Uncommon Files |
| .BCE | Uncommon Files |
| .BCF | Page Layout Files |
| .BCG | Uncommon Files |
| .BCH | Uncommon Files |
| .BCI | Data Files |
| .BCJ | Uncommon Files |
| .BCK | Backup Files |
| .BCKP | Backup Files |
| .BCL | Uncommon Files |
| .BCM | Data Files |
| .BCMR | Uncommon Files |
| .BCN | Uncommon Files |
| .BCO | Uncommon Files |
| .BCP | Page Layout Files |
| .BCPIO | Data Files |
| .BCQ | Uncommon Files |
| .BCR | Uncommon Files |
| .BCS | Settings Files |
| .BCT | Data Files |
| .BCU | Uncommon Files |
| .BCV | Uncommon Files |
| .BCW | Uncommon Files |
| .BCX | Uncommon Files |
| .BCY | Uncommon Files |
| .BCZ | Uncommon Files |
| Extension | File Description |
| .BD | Uncommon Files |
| .BD0 | Uncommon Files |
| .BD1 | Uncommon Files |
| .BD2 | Uncommon Files |
| .BD3 | Uncommon Files |
| .BD4 | Uncommon Files |
| .BD5 | Uncommon Files |
| .BD6 | Uncommon Files |
| .BD7 | Uncommon Files |
| .BD8 | Uncommon Files |
| .BD9 | Uncommon Files |
| .BDA | Uncommon Files |
| .BDB | Backup Files |
| .BDBZM | Uncommon Files |
| .BDC | CAD Files |
| .BDD | Audio Files |
| .BDE | Uncommon Files |
| .BDF | Font Files |
| .BDG | Uncommon Files |
| .BDH | Uncommon Files |
| .BDI | Uncommon Files |
| .BDIC | Data Files |
| .BDJ | Uncommon Files |
| .BDK | Uncommon Files |
| .BDL | CAD Files |
| .BDM | Video Files |
| .BDMV | Video Files |
| .BDN | Uncommon Files |
| .BDO | Uncommon Files |
| .BDP | Uncommon Files |
| .BDQ | Uncommon Files |
| .BDR | Misc Files |
| .BDRUM1 | Uncommon Files |
| .BDS | Uncommon Files |
| .BDSPROJ | Developer Files |
| .BDT | Uncommon Files |
| .BDU | Uncommon Files |
| .BDV | Uncommon Files |
| .BDW | Uncommon Files |
| .BDX | Uncommon Files |
| .BDY | Uncommon Files |
| .BDZ | Uncommon Files |
| .BE | Uncommon Files |
| .BE0 | Uncommon Files |
| .BE1 | Uncommon Files |
| .BE2 | Uncommon Files |
| .BE3 | Uncommon Files |
| .BE4 | Uncommon Files |
| .BE5 | Uncommon Files |
| .BE6 | Uncommon Files |
| .BE7 | Uncommon Files |
| .BE8 | Uncommon Files |
| .BE9 | Uncommon Files |
| .BEA | Uncommon Files |
| .BEACHBALL | Uncommon Files |
| .BEACON | Uncommon Files |
| .BEAM | Executable Files |
| .BEANS | Uncommon Files |
| .BEAT | Uncommon Files |
| .BEATWAVE | Uncommon Files |
| .BEB | Uncommon Files |
| .BEC | Uncommon Files |
| .BED | Uncommon Files |
| .BEE | Uncommon Files |
| .BEEP | Uncommon Files |
| .BEF | Uncommon Files |
| .BEG | Uncommon Files |
| .BEGIN | Uncommon Files |
| .BEGINNERS | Uncommon Files |
| .BEGINNING | Uncommon Files |
| .BEH | Uncommon Files |
| .BEHEADER | Uncommon Files |
| .BEHINDTHEW | Uncommon Files |
| .BEI | Uncommon Files |
| .BEJ | Uncommon Files |
