Cannot register on windows

[pierrecavalier]

Describe the issue
I tried to run fink_client_register on windows and i got this error:

Traceback (most recent call last):
  File "c:\users\pirca\anaconda3\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\pirca\anaconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\pirca\anaconda3\Scripts\fink_client_register.exe\__main__.py", line 4, in <module>
  File "c:\users\pirca\anaconda3\lib\site-packages\fink_client\scripts\fink_client_register.py", line 16, in <module>
    from fink_client.configuration import write_credentials
  File "c:\users\pirca\anaconda3\lib\site-packages\fink_client\configuration.py", line 21, in <module>
    _ROOTDIR = os.path.join(os.environ['HOME'], ".finkclient")
  File "c:\users\pirca\anaconda3\lib\os.py", line 675, in __getitem__
    raise KeyError(key) from None
KeyError: 'HOME'