| 11. | .bak | Backup |
| 12. | .bal | Music score (Ballade) |
| 13. | .bar | Compressed file archive (Unix BAR archive) ◊ Horizontal bar menu object file (dBASE Application Generator) |
| 14. | .bas | BASIC language source code file (QuickBASIC - GW-BASIC) |
| 15. | .bat | Batch file (DOS) |
| 16. | bad.fix | A failed attempt to repair a computer bug; a fix that doesn't work or that introduces new and unexpected problems. The expression has cropped up a lot in relation to Y2K fixes. |
| 17. | .bb | Database backup (Papyrus) |
| 18. | .bbl | Bibliographic reference (TeX/BibTeX) |
| 19. | .bbm | Brush (Deluxe Paint) |
| 20. | .bbnng | Bitmap graphics (BBN BitGraph terminal Display Pixel Data (DPD) sequence) |
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