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Can't run mutmut Windows 10

See original GitHub issue

My project structure.

project
|-my_project\
|-tests\
|-venv.tests\
|-setup.cfg

My setup.cfg:

[mutmut]
runner="python -m unittest discover"
paths-to-mutate="my_project\"
tests-dir="tests\"

When I run python -m mutmut run from project I get an error:

Traceback (most recent call last):
  File "C:\Users\...\AppData\Local\Programs\Python\Python37\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "C:\Users\...\AppData\Local\Programs\Python\Python37\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "X:\Projects\project\venv.tests\lib\site-packages\mutmut\__main__.py", line 784, in <module>
    climain()
  File "X:\Projects\project\venv.tests\lib\site-packages\click\core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "X:\Projects\project\venv.tests\lib\site-packages\click\core.py", line 717, in main
    rv = self.invoke(ctx)
  File "X:\Projects\project\venv.tests\lib\site-packages\click\core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "X:\Projects\project\venv.tests\lib\site-packages\click\core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "X:\Projects\project\venv.tests\lib\site-packages\mutmut\__main__.py", line 74, in wrapper
    f(*args, **kwargs)
  File "X:\Projects\project\venv.tests\lib\site-packages\mutmut\__main__.py", line 254, in climain
    post_mutation, use_patch_file))
  File "X:\Projects\project\venv.tests\lib\site-packages\mutmut\__main__.py", line 352, in main
    using_testmon=using_testmon
  File "X:\Projects\project\venv.tests\lib\site-packages\mutmut\__main__.py", line 689, in time_test_suite
    returncode = popen_streaming_output(test_command, feedback)
  File "X:\Projects\project\venv.tests\lib\site-packages\mutmut\__main__.py", line 459, in popen_streaming_output
    stderr=subprocess.PIPE
  File "C:\Users\...\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 775, in __init__
    restore_signals, start_new_session)
  File "C:\Users\...\AppData\Local\Programs\Python\Python37\lib\subprocess.py", line 1178, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified