| Extension | File Description |
| .BTC | Uncommon Files |
| .BTD | Uncommon Files |
| .BTE | Uncommon Files |
| .BTG | Uncommon Files |
| .BTH | Uncommon Files |
| .BTI | Uncommon Files |
| .BTJ | Uncommon Files |
| .BTK | Uncommon Files |
| .BTL | Uncommon Files |
| .BTNDATA | Uncommon Files |
| .BTP | Uncommon Files |
| .BTPC | Uncommon Files |
| .BTQ | Uncommon Files |
| .BTREE | Uncommon Files |
| .BTS | Uncommon Files |
| .BTT | Uncommon Files |
| .BTU | Uncommon Files |
| .BTV | Uncommon 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 |
| .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 |
| .BUNNY | Uncommon Files |
| .BUNNY2 | Uncommon Files |
| .BUO | Uncommon Files |
| .BUQ | Uncommon Files |
| .BUR | Uncommon Files |
| .BUREAU | Uncommon Files |
| .BURGER | Uncommon Files |
| .BURNING | Uncommon Files |
| .BURST | Uncommon Files |
| .BUSH | Uncommon Files |
| .BUSYBOX | Uncommon Files |
| .BUT | Uncommon 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 |
| Extension | File Description |
| .BV1 | Uncommon Files |
| .BV2 | Uncommon Files |
| .BV3 | Uncommon Files |
| .BV4 | Uncommon Files |
| .BV5 | Uncommon Files |
| .BV6 | Uncommon Files |
| .BV7 | Uncommon Files |
| .BV8 | Uncommon Files |
| .BV9 | Uncommon Files |
| .BVA | Uncommon Files |
| .BVB | Uncommon Files |
| .BVC | Uncommon Files |
| .BVE | Uncommon Files |
| .BVF | Uncommon Files |
| .BVG | Uncommon Files |
| .BVI | Uncommon Files |
| .BVJ | Uncommon Files |
| .BVK | Uncommon Files |
| .BVL | Uncommon Files |
| .BVM | Uncommon Files |
| .BVN | Uncommon Files |
| .BVO | Uncommon Files |
| .BVP | Uncommon Files |
| .BVQ | Uncommon Files |
| .BVR | Uncommon Files |
| .BVS | Uncommon Files |
| .BVT | Uncommon Files |
| .BVU | Uncommon Files |
| .BVV | Uncommon Files |
| .BVW | Uncommon Files |
| .BVX | Uncommon Files |
| .BVY | Uncommon Files |
| .BVZ | Uncommon Files |
| .BW | Uncommon Files |
| .BW0 | Uncommon Files |
| .BW1 | Uncommon Files |
| .BW2 | Uncommon Files |
| .BW3 | Uncommon Files |
| .BW4 | Uncommon Files |
| .BW5 | Uncommon Files |
| .BW6 | Uncommon Files |
| .BW7 | Uncommon Files |
| .BW8 | Uncommon Files |
| .BW9 | Uncommon Files |
| .BWB | Uncommon Files |
| .BWC | Uncommon Files |
| .BWD | Uncommon Files |
| .BWE | Uncommon Files |
| .BWF | Uncommon Files |
| .BWG | Uncommon Files |
| .BWH | Uncommon Files |
| .BWJ | Uncommon Files |
| .BWK | Uncommon Files |
| .BWL | Uncommon Files |
| .BWM | Uncommon Files |
| .BWN | Uncommon Files |
| .BWO | Uncommon Files |
| .BWQ | Uncommon Files |
| .BWR | Uncommon Files |
| .BWU | Uncommon Files |
| .BWV | Uncommon Files |
| .BWW | Uncommon Files |
| .BWX | Uncommon Files |
| .BWY | Uncommon Files |
| .BX0 | Uncommon Files |
| .BX1 | Uncommon Files |
| .BX2 | Uncommon Files |
| .BX3 | Uncommon Files |
| .BX4 | Uncommon Files |
| .BX5 | Uncommon Files |
| .BX6 | Uncommon Files |
| .BX7 | Uncommon Files |
| .BX8 | Uncommon Files |
| .BX9 | Uncommon Files |
| .BXA | Uncommon Files |
