Split 123 sheets

Download and install the latest version of Filestar.
Right click on one or more 123 file(s) on your desktop and select Convert with Filestar.
Type split sheets in the search box.
Press Split.

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 3, 2026