| 21. | .bbp | Bezier surface file |
| 22. | .bbs | Bulletin Board System announce or text info ◊ Hudson-style messagebase (FTN software) |
| 23. | .bch | Batch process object file (dBASE Application Generator) ◊ Datafile (Datalex EntryPoint 90) |
| 24. | .bck | Backup (VMS/VAX) |
| 25. | .bcm | Communication script backup (Microsoft Works) |
| 26. | .bco | Outline font description (Bitstream) |
| 27. | .bcp | Makefile (Borland C++) |
| 28. | .bcs | Browse information (Windows95) |
| 29. | .bct | Backup dictionary (Clarion) |
| 30. | .bcw | Workspace (Environment settings) (Borland C++) |
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