What could be the reason for fatal python error:initfsencoding:unable to load the file system codec?

Fixed in 4c18633.
The problem is that for version x64 for Python 3.7 it is not working due to class config for freezer.py.
You need to go cx_Freezer installation folder. If you have a virtual environment, go to your environment folder \lib\site-packages\cx_Freeze,
find the freezer.py and add the code found on the commit.

You can find the patch at
GitHub

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