| 81. | .bks | Bookself (IBM BookManager) ◊ Worksheet backup (Microsoft Works) |
| 82. | .bkw | Mirror image of font set (FontEdit) |
| 83. | .blb | Resource archive (DreamWorks, Neverhood) |
| 84. | .bld | Bloadable picture (BASIC) ◊ Build file |
| 85. | .blg | Backup Log (ARCSOLO) ◊ BibTex log |
| 86. | .blk | Graphics (Alias Wavefront) ◊ Temporary file (WordPerfect) |
| 87. | .bll | Dynamic Load Library (Borland) |
| 88. | .blt | Configuration for AOL Instant Messenger |
| 89. | .blw | world file for bil image (ArcView) |
| 90. | .bm | Bitmap graphics (1bit text) (X Window BitMap) |
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