| 1. | .lsa | Ascii data (LightScape Technologies) |
| 2. | .lsb | Binary data (LightScape Technologies) |
| 3. | .lsf | Logos library system file |
| 4. | .lsl | Saved library (Corel Paradox) ◊ Script library (Lotus) |
| 5. | .lsp | Lisp language source code file (AutoLISP - Xlisp) |
| 6. | .lss | Spreadsheet (Legato - IBM Works for OS/2) |
| 7. | .lst | Keyboard macro (1st Reader) ◊ List file (archive index - compiler listfile) ◊ Listing (e.g. source code) ◊ Spool file (Oracle) |
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