123 File Extension - Open .123 files

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Common File Extensions

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.123 File Extension

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File Type

Lotus 1-2-3 Spreadsheet

Category

Data Files

Common?

Yes

File Description

Spreadsheet created by Lotus 1-2-3, part of IBM Lotus SmartSuite; organizes data in rows and columns; functions can be applied to the data in various cells, which can automatically populate the data in other cells.

Lotus 1-2-3 was first developed by Lotus Development Corporation, which was bought by IBM in 1995; the "1-2-3" refers to the program's three main capabilities: 1) spreadsheet functions, 2) creating charts and graphs, and 3) basic database operations.

Program(s) that open 123 files

Windows

IBM Lotus 1-2-3