| Abbreviation | Definition |
|---|---|
| BK2 | Timed backup file for document window 2 (WordPerfect for Win) |
| BK3 | Timed backup file for document window 3 (WordPerfect for Win) |
| BK4 | Timed backup file for document window 4 ( WordPerfect for Win) |
| BK5 | Timed backup file for document window 5 (WordPerfect for Win) |
| BK6 | Timed backup file for document window 6 (WordPerfect for Win) |
| BK7 | Timed backup file for document window 7 (WordPerfect for Win) |
| BK8 | Timed backup file for document window 8 (WordPerfect for Win) |
| BK9 | Timed backup file for document window 9 (WordPerfect for Win) |
| BKI | Backup index (IBM BookManager) |
| BKP | Backup file (Write - TurboVidion DialogDesigner) |
| BKS | Bookshelf (IBM BookManager) |
| BKS | Worksheet backup (MS Works) |
| BKW | Mirror image of font set (FontEdit) |
| BLD | Bloadable picture (BASIC) |
| BLG | Backup Log (ARCSOLO) |
| BLG | BibTex log |
| BLK | Temporary file (WordPerfect for Win) |
| BM | X-Window BitMap Bitmap graphics (1bit text) |
| BM1 | Game data (Apogee BioMenace) |
| BMF | Graphics (Binary Material Format) (Corel) |