def is_dos_style_abspath(path):
    """
    Check whether the given path is a DOS/Windows style absolute path.

    path: A path string
    """
    if len(path) < 3:
        return False
    drv = path[0]  # drive letter
    # A:65, B:66, ... Z:90, a:97, b:98, ... z:122
    if ord(drv) < 65 or (ord(drv) > 90 and ord(drv) < 97) or ord(drv) > 122:
        return False
    return path[1:3] == ":\\"