| 21. | .lcl | Data (FTP Software PC/TCP) |
| 22. | .lcn | Lection (WordPerfect) |
| 23. | .lcs | Datafile (ACT! History Files) |
| 24. | .lcw | Spreadsheet (Lucid 3-D) |
| 25. | .ld | Long Distance area codes file (Telix) |
| 26. | .ld1 | Overlay file (dBASE) |
| 27. | .ldb | Data filer database (IBM Works for OS/2) ◊ Record-locking information (Microsoft Access) |
| 28. | .ldf | Bitmap graphics (LuraDocument) ◊ Data filer form (IBM Works for OS/2) ◊ Library definition file (Geoworks) |
| 29. | .ldif | Email exchange file (Microsoft, Netscape) |
| 30. | .ldl | Library (Corel Paradox) |
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