| blorb | Interactive Fiction Package |
| bls | Blockland Saved Game |
| blue | EVE Online Generic Data File |
| blv | Might and Magic 6 Level Geometry Data |
| bly | FIFA World Cup Game Data |
| blz | N-Gage Video Game |
| bm1 | Apogee Bio Menace Map |
| bmd | MU Online Game Data |
| bmd | Super Mario Sunshine Game Data |
| bme | BeatMania Song |
| bmg | Mario Kart Wii Message File |
| bmq | Re-Volt Texture Data |
| bms | BeatMania Song |
| bms | Be-Music Script |
| bmu | Bioware Aurora Music Unit |
| bmz | Portal Bonus Map Zip |
| bng | The Bingo Maker Card |
| bni | Battle.net Icon File |
| bnry | The Sims 4 Game Data |
| bnt | Entropia Universe Game Archive |
| bo2 | TerrainControl Custom Biome Objects v2 |
| bo3 | TerrainControl Custom Biome Objects v3 |
| bod | X3: Reunion Ship Data |
| bol | Mario Kart Wii Course Setup |
| bos | Fallout Tactics: Brotherhood of Steel Data |
| bot | Quake FrogBot Data |
| bpe | WWE Texture Archive |
| brasd | Mario Kart Binary Revolution Animation Sound Data |
| brlyt | Wii Textures and Material Lists |
| brmdl | Mario Kart Wii 3D Model Data |
