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.
Or let an AI agent do it: filestarcli -i file.123 -c "split sheets" (how).
Let your AI agent split 123 sheets
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine. It works on Windows, macOS only.
“Use Filestar to split 123 sheets in my Downloads folder”
Or run it yourself:
filestarcli -i file.123 -c "split sheets"
Runs on your computer, so your files stay on it. Works on Windows and macOS. 50 free conversions with the npm install, no account needed.
Can my AI agent split 123 sheets?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.123 -c "split sheets" on your computer, so your files stay on it.
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.
