docs: def get_dependency_walker():
    """
    Checks if `depends.exe` is in the system PATH. If not, it will be downloaded
    and extracted to a temporary directory. Note that the file will not be
    deleted afterwards.
  
    Returns the path to the Dependency Walker executable.
    """
  
    for dirname in os.getenv('PATH', '').split(os.pathsep):
      filename = os.path.join(dirname, 'depends.exe')
      if os.path.isfile(filename):
        logger.info('Dependency Walker found at "{}"'.format(filename))
        return filename
  
    temp_exe = os.path.join(tempfile.gettempdir(), 'depends.exe')
    temp_dll = os.path.join(tempfile.gettempdir(), 'depends.dll')
    if os.path.isfile(temp_exe):
      logger.info('Dependency Walker found at "{}"'.format(temp_exe))
      return temp_exe
  
    logger.info('Dependency Walker not found. Downloading ...')
    with urlopen('http://dependencywalker.com/depends22_x64.zip') as fp:
      data = fp.read()
  
    logger.info('Extracting Dependency Walker to "{}"'.format(temp_exe))
    with zipfile.ZipFile(io.BytesIO(data)) as fp:
      with fp.open('depends.exe') as src:
        with open(temp_exe, 'wb') as dst:
          shutil.copyfileobj(src, dst)
      with fp.open('depends.dll') as src:
        with open(temp_dll, 'wb') as dst:
          shutil.copyfileobj(src, dst)
  
    return temp_exe