| bd1 | X Operations Data |
| bdcff | Boulder Dash Construction Kit Data |
| bec | Gladius Game Data |
| bex | Boom Extension |
| bf | Cryo BF Game Data |
| bfb | Zoo Tycoon 2 Model |
| bfg | Big Fish Games Application |
| bfhp | Celtic Kings Game Data |
| bfm | Bloodrayne Model Data |
| bfont | Need for Speed: Shift Font |
| bfp | TOCA Touring Car Championship Game Data |
| bfres | Mario Kart 8 Binary Cafe Resources Data |
| bfs | FlatOut Game Data |
| bfsar | Mario Kart 8 Effects Data |
| bg | Backgammon for Windows Saved Game |
| bgf | Jack Nicklaus 4 Game Data |
| bgl | MS Flight Simulator Compressed Scenery |
| bgui | Need for Speed Shift GUI Data |
| bgz | Blood Frontier Map Data |
| bh3 | Rise of Nations Unit Graphic Data |
| bha | Rise of Nations Unit Graphic Data |
| bhs | Rise of Nations Script |
| bic | Civilization 3 Scenario |
| bidmp | Armed Assault Crash Dump |
| bif | Bioware Game Data |
| big | EA Compressed Game Archive |
| bin3 | This War of Mine Configuration Data |
| biq | Civilization 3 Scenario |
| bkg | BKG Backgammon Game Data |
| bksb | Temple Run 3D Model |
| blight | Mario Kart Binary Light Data |
| blk | Descent Mission Builder Block |
| blorb | Interactive Fiction Package |
| bls | Blockland Saved Game |
| blue | EVE Online Generic Data File |