Download and install the latest version of Filestar.
Right click on one or more Xml file(s) on your desktop and select Convert with Filestar.
Type convert to xltx in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.xml -c "convert to xltx" (how).
Let your AI agent convert Excel 2003 XML Spreadsheet to XLTX
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Convert the Excel 2003 XML Spreadsheet files in my Downloads folder to XLTX”
Or run it yourself:
filestarcli -i file.xml -c "convert to xltx"
Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.
Can my AI agent convert Excel 2003 XML Spreadsheet to XLTX?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.xml -c "convert to xltx" on your computer, so your files stay on it.
An Excel 2003 XML spreadsheet is a Microsoft Excel workbook saved as a single XML file in the SpreadsheetML format of Excel 2002/2003. It holds the worksheets, cell values, formulas and styles.
An XLTX file is a template created by Microsoft Excel, a program used for creating spreadsheets.
