| Extension | File Description |
| .BRV | Uncommon Files |
| .BRW | Data Files |
| .BRX | Developer Files |
| .BRY | Uncommon Files |
| .BRZ | Uncommon Files |
| .BS | Uncommon Files |
| .BS0 | Uncommon Files |
| .BS1 | Game Files |
| .BS2 | Developer Files |
| .BS3 | Uncommon Files |
| .BS4 | Uncommon Files |
| .BS5 | Uncommon Files |
| .BS6 | Uncommon Files |
| .BS7 | Uncommon Files |
| .BS8 | Uncommon Files |
| .BS9 | Uncommon Files |
| .BSA | Game Files |
| .BSB | Game Files |
| .BSC | Developer Files |
| .BSCS | Uncommon Files |
| .BSCT | Uncommon Files |
| .BSD | Uncommon Files |
| .BSE | Uncommon Files |
| .BSF | Video Files |
| .BSG | Uncommon Files |
| .BSH | Developer Files |
| .BSI | Uncommon Files |
| .BSJ | Uncommon Files |
| .BSK | Encoded Files |
| .BSL | Uncommon Files |
| .BSM | Uncommon Files |
| .BSN | Uncommon Files |
| .BSO | Uncommon Files |
| .BSP | Game Files |
| .BSQ | Uncommon Files |
| .BSR | Uncommon Files |
| .BSS | Uncommon Files |
| .BST | Misc Files |
| .BSU | Uncommon Files |
| .BSV | Uncommon Files |
| .BSW | Uncommon Files |
| .BSX | Uncommon Files |
| .BSY | Uncommon Files |
| .BSZ | Uncommon Files |
| .BS_ | Uncommon Files |
| .BT | Uncommon Files |
| .BT0 | Uncommon Files |
| .BT1 | Uncommon Files |
| .BT2 | Uncommon Files |
| .BT3 | Uncommon Files |
| .BT4 | Uncommon Files |
| .BT5 | Uncommon Files |
| .BT6 | Uncommon Files |
| .BT7 | Uncommon Files |
| .BT8 | Uncommon Files |
| .BT9 | Uncommon Files |
| .BTA | Uncommon Files |
| .BTAB | Uncommon Files |
| .BTB | Uncommon Files |
| .BTC | Uncommon Files |
| .BTD | Uncommon Files |
| .BTE | Uncommon Files |
| .BTF | Data Files |
| .BTG | Uncommon Files |
| .BTH | Uncommon Files |
| .BTI | Uncommon Files |
| .BTIF | Data Files |
| .BTJ | Uncommon Files |
| .BTK | Uncommon Files |
| .BTL | Uncommon Files |
| .BTM | Data Files |
| .BTN | Developer Files |
| .BTNDATA | Uncommon Files |
| .BTO | 3D Image Files |
| .BTOA | Encoded Files |
| Extension | File Description |
| .BTP | Uncommon Files |
| .BTPC | Uncommon Files |
| .BTQ | Uncommon Files |
| .BTR | Database Files |
| .BTREE | Uncommon Files |
| .BTS | Uncommon Files |
| .BTT | Uncommon Files |
| .BTU | Uncommon Files |
| .BTV | Uncommon Files |
| .BTW | Page Layout Files |
| .BTX | Uncommon Files |
| .BTY | Uncommon Files |
| .BTZ | Uncommon Files |
| .BU | Uncommon Files |
| .BU0 | Uncommon Files |
| .BU1 | Uncommon Files |
| .BU2 | Uncommon Files |
| .BU3 | Uncommon Files |
| .BU4 | Uncommon Files |
| .BU5 | Uncommon Files |
| .BU6 | Uncommon Files |
| .BU7 | Uncommon Files |
| .BU8 | Uncommon Files |
| .BU9 | Uncommon Files |
| .BUA | Uncommon Files |
| .BUB | Uncommon Files |
| .BUBBLES | Uncommon Files |
| .BUC | Uncommon Files |
| .BUD | Uncommon Files |
| .BUDGET | Uncommon Files |
| .BUDGETS | Uncommon Files |
| .BUDGETX | Uncommon Files |
| .BUE | Uncommon Files |
| .BUF | Misc Files |
| .BUFFER | Uncommon Files |
| .BUFR | Uncommon Files |
| .BUG | Uncommon Files |
| .BUGFIXES | Uncommon Files |
| .BUGS | Uncommon Files |
| .BUH | Uncommon Files |
| .BUI | Uncommon Files |
| .BUILD | Uncommon Files |
| .BUILDER | Uncommon Files |
| .BUJ | Uncommon Files |
| .BUK | Uncommon Files |
| .BUL | Uncommon Files |
| .BUM | Uncommon Files |
| .BUN | Audio Files |
| .BUNDLE | Plugin Files |
| .BUNNY | Uncommon Files |
| .BUNNY2 | Uncommon Files |
| .BUO | Uncommon Files |
| .BUP | Backup Files |
| .BUQ | Uncommon Files |
| .BUR | Uncommon Files |
| .BUREAU | Uncommon Files |
| .BURGER | Uncommon Files |
| .BURNING | Uncommon Files |
| .BURST | Uncommon Files |
| .BUS | Game Files |
| .BUSH | Uncommon Files |
| .BUSYBOX | Uncommon Files |
| .BUT | Uncommon Files |
| .BUTTHEREIS | Data Files |
| .BUTTONS4 | Uncommon Files |
| .BUU | Uncommon Files |
| .BUV | Uncommon Files |
| .BUW | Uncommon Files |
| .BUX | Uncommon Files |
| .BUY | Uncommon Files |
| .BUYING | Uncommon Files |
| .BUZ | Uncommon Files |
| .BV0 | Uncommon Files |
| .BV1 | Uncommon Files |
| .BV2 | Uncommon Files |
