Lotus 1-2-3 Worksheet 9.8 Millennium
Unknownspreadsheet
Lotus 1-2-3 Workbook is a spreadsheet program produced by the Lotus Software Group (later acquired by IBM). The original release was in 1983 and it has been discontinued since 2013. The original 1-2-3 files have .wks extensions. Version 2.0 originally used a .wk1 extension but this was changed quickly to .wk2 and after this the number in the extension corrolates with the version number. Some later versions have the extension .123
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| Extensions | .123 |
|---|---|
| MIME types | application/vnd.lotus-1-2-3application/x-123 |
| Signatures | 00001a0005100400 at byte 0 (Lotus 1-2-3 Worksheet Version 9.8 Millennium) |
| PRONOM | fmt/1453 |
| Wikidata | Q109996609 |
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From PRONOM, Wikidata. Updated 2026-10-20.