| 1. | .bk | Faxbook (JetFax) |
| 2. | .bk! | Document backup (WordPerfect) |
| 3. | .bk$ | Backup file |
| 4. | .bk1 | Timed backup file for document window 1 (WordPerfect) |
| 5. | .bk2 | Timed backup file for document window 2 (WordPerfect) |
| 6. | .bk3 | Timed backup file for document window 3 (WordPerfect) |
| 7. | .bk4 | Timed backup file for document window 4 (WordPerfect) |
| 8. | .bk5 | Timed backup file for document window 5 (WordPerfect) |
| 9. | .bk6 | Timed backup file for document window 6 (WordPerfect) |
| 10. | .bk7 | Timed backup file for document window 7 (WordPerfect) |
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