[Bug]: Unable to run on Windows 10, Python 3.10

[ntlhui]

On Windows 10, using Windows Store Python 3.10

In PowerShell

python3.10 -m venv .venv
.venv\Scripts\activate.ps1
python -m pip install gpx-cmd-tools
gpxsplitter -h

This results in Windows attempting to open the gpxsplitter file. Since there is no file extension, Windows does not know the correct program to use. Even so, .py files may not be configured to open directly with Python.

Recommend switching to setuptools.setup as described here: https://docs.python.org/3/distutils/setupscript.html