.123 File Extension

Lotus/IBM 1-2-3 Spreadsheet File

Data File
The .123 file extension belongs to Lotus 1-2-3, a spreadsheet application from Lotus Software which is now part of IBM.

These files contain your spread-sheet data.

Lotus 1-2-3 was IBM PC's first killer application; its huge popularity in mid-1980s contributed significantly to the success of IBM PC in the corporate environment.






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