Print 123

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What is .123?

Name: Lotus 1-2-3 Spreadsheet
Extension: .123
Format: Binary
Category: Spreadsheet
Developer: IBM
Description: The 123 file format is a proprietary file format developed by the Lotus Development Corporation for use with its Lotus 1-2-3 spreadsheet software. It is a binary file format, which means that it stores data in a binary format that is not easily readable by humans.
MIME Type: application/vnd.lotus-1-2-3
Wikipedia: .123 on Wikipedia

Last updated October 1, 2026