For those who didn't want to buy the full suite, Leo found a secret: SoftMaker FreeOffice

Try opening it directly in Excel:

Fortunately, there are several free solutions available that can help you convert PMDX files to Excel. Here are a few options:

Open the .pmdx file with (free) or even plain Notepad.

It is the only method that guarantees high accuracy. Since it's the native program, it handles internal formulas and formatting better than any generic online converter.

tree = ET.parse('your_file.pmdx') root = tree.getroot()