| 11. | .lbl | Label (dBASE IV - Clipper 5 - dBFast) |
| 12. | .lbm | Bitmap graphics (Amiga Interleaved BitMap format) (Deluxe Paint) ◊ Linear bitmap graphics (XLib) |
| 13. | .lbo | Compiled label (dBASE IV) |
| 14. | .lbr | Compressed file archive (LU) ◊ Display driver (Lotus 1-2-3) |
| 15. | .lbt | Additional (FPT) label description file (FoxPro) |
| 16. | .lbx | Main (DBF) label description file (FoxPro) |
| 17. | .lcd | The format of the .lcd file created by Dream Animator. This info is just educated guesses but it is how DC Animator uses the file. |
| 18. | .lcf | License Collection File (Folio Infobase) ◊ Linker Control File (Norton Guides compiler) |
| 19. | .lch | Chart (IBM Works for OS/2) ◊ Latch time (monitoring network's response time) |
| 20. | .lck | Lock file (especially for database access control) |
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