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 xml in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.123 -c "convert to xml" (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 XML
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 XML”
Or run it yourself:
filestarcli -i file.123 -c "convert to xml"
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 XML?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.123 -c "convert to xml" 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.
An XML file is an XML (Extensible Markup Language) data file. It is formatted much like an .HTML document, but uses custom tags to define objects and the data within each object. XML files can be thought of as a text-based database.
