Got it, let's tackle your two spreadsheet conversion questions clearly—whether you need a quick GUI method or a scriptable command-line solution, I've got you covered.

If you prefer a graphical interface, these are the most reliable options:

• Using Microsoft Excel
  Simply open your Office XML spreadsheet directly in Excel (drag-and-drop works, or use File > Open). Once it's loaded, go to File > Save As, select the Excel 97-2003 Workbook (*.xls) format from the dropdown, and save. This is the most straightforward method if you have access to Excel.

• Using LibreOffice Calc (Free & Open Source)
  LibreOffice handles Office XML files seamlessly. Open the XML file in Calc, then navigate to File > Save As. Choose Microsoft Excel 97-2003 from the format list, adjust any save options if needed, and click save. No cost, no subscription required.

For automated or batch conversions, the best cross-platform tool is LibreOffice in headless mode (works on Windows, macOS, and Linux). Here's how to use it:

First, make sure LibreOffice is installed on your system. Then run these commands in your terminal/command prompt:

Convert to .xls #

soffice --headless --convert-to xls:"MS Excel 97" your_input_file.xml

Convert to .ods #

soffice --headless --convert-to ods your_input_file.xml

Key parameter breakdown:

• --headless: Launches LibreOffice without a graphical interface, perfect for scripts or server environments.
• --convert-to: Specifies the output format. For .xls, we add the "MS Excel 97" filter to ensure compatibility with older Excel versions.
• your_input_file.xml: Replace this with the actual path/name of your Office XML file.

Extra tips:

• On Windows, you might need to use the full path to the executable if it's not in your system PATH, e.g.:

  "C:\Program Files\LibreOffice\program\soffice.exe" --headless --convert-to ods your_input_file.xml
  

• To batch convert all XML files in a folder, use a wildcard:

  soffice --headless --convert-to ods *.xml
  

• Ensure no other LibreOffice windows are open when running headless commands—this can cause conflicts.

内容的提问来源于stack exchange，提问作者Sashko Lykhenko