python2.7 - python mammoth zipfile.BadZipfile: File is not a zip file

#mammoth 是一个将docx文件转换为HTML文件的库,执行报错如下
$ mammoth.exe test.docx  test.html
Traceback (most recent call last):
  File "d:\python27\lib\runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "d:\python27\lib\runpy.py", line 72, in _run_code
    exec code in run_globals
  File "d:\Python27\Scripts\mammoth.exe\__main__.py", line 9, in 
  File "d:\python27\lib\site-packages\mammoth\cli.py", line 33, in main
    output_format=args.output_format,
  File "d:\python27\lib\site-packages\mammoth\__init__.py", line 20, in convert
    kwargs["style_map"] = read_style_map(fileobj)
  File "d:\python27\lib\site-packages\mammoth\docx\style_map.py", line 66, in re
ad_style_map
    with open_zip(fileobj, "r") as zip_file:
  File "d:\python27\lib\site-packages\mammoth\zips.py", line 9, in open_zip
    return _Zip(ZipFile(fileobj, mode))
  File "d:\python27\lib\zipfile.py", line 770, in __init__
    self._RealGetContents()
  File "d:\python27\lib\zipfile.py", line 811, in _RealGetContents
    raise BadZipfile, "File is not a zip file"
zipfile.BadZipfile: File is not a zip file