i have tested it with Python 3.x; if you have .py files in Windows set to open with a Python 3.x interpreter, you can drag and drop one XM file to CheekSquisher_v1.0b3.py: you can set it, by right clicking the .py file > Properties > clicking the Change... button in the Opens with: field > selecting the Python 3.x interpreter executable
if you want to use command prompt, a setup is to have your Python 3.x interpreter folder in the PATH environment variable (the Python installer has an option that does that), and in a folder, for example, where CheekSquisher_v1.0b3.py along a XM file, in this example named Untitled.xm is, typing a command like this do:
python CheekSquisher_v1.0b3.py Untitled.xm
the interpreter executable may have other name, maybe like python3 for example, you can check what it is in the folder it is intalled in
heres a full example session for reference, in Cygwin; a Command prompt equivalent would be:
python -V
D:
cd py
dir
python CheekSquisher_v1.0b3.py Untitled.xm
you are utmost welcome to ask anything, follow up question and otherwise