musicxml2ly on Windows

[TaoCG]

Dear all,

what would be the best way to invoke musicxml2ly on Windows when there is
also a Python 3 installation.
When I try to run it with the python that comes with lilypond like this

python.exe musicxml2ly.py test.xml

I get this error:
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
'import site' failed; use -v for traceback
Traceback (most recent call last):
  File "musicxml2ly.py", line 3, in ?
    import optparse
ImportError: No module named optparse

This is with Lilypond 2.16


Regards,
Tao



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