Unable to open Filestream

[Kein]

n:\1>bits_parser.py qmgr0.dat
Traceback (most recent call last):
  File "N:\1\bits_parser.py", line 102, in <module>
    analyzer = bits.Bits.load_file(file_in)
  File "C:\Programs\Python\lib\site-packages\bits\bits.py", line 47, in load_file
    path = Path(fp).resolve()
  File "C:\Programs\Python\lib\pathlib.py", line 1177, in resolve
    s = self._flavour.resolve(self, strict=strict)
  File "C:\Programs\Python\lib\pathlib.py", line 205, in resolve
    s = self._ext_to_normal(_getfinalpathname(s))
OSError: [WinError 1] Incorrect function: 'qmgr0.dat'

Windows 7 x64 Python 3.8.5