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 convert to xlm in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.123 -c "convert to xlm" (how).
Documents - File Explorer─☐✕
This PC › Documents
Home
Desktop
Downloads
Documents
Pictures
Music
.123Contract.123
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
ConvertMergeCompressExtractMoveZip
Let your AI agent convert 123 to XLM
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.
“Convert the 123 files in my Downloads folder to XLM”
Or run it yourself:
filestarcli -i file.123 -c "convert to xlm"
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 convert 123 to XLM?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.123 -c "convert to xlm" 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.
XLM (Microsoft Excel Macro) is a file type that stores macro code written in the Excel macro language. It is used to automate tasks within a Microsoft Excel document, such as performing calculations, formatting data, and performing other more complex tasks. XLM files can be opened in Microsoft Excel and other compatible programs.