请问decompyle-2.3如何使用阿

我按照网上搜索到的一篇帖子上说的输入：
C:\Python22>python D:\decompyle-2.3\decompyle.py -o . D:\decompyle-2.3\iu.pyc

显示如下错误：
Mon Apr 18 15:53:27 2005
### Can't decompyle  iu.pyc
Traceback (most recent call last):
  File "D:\decompyle-2.3\decompyle.py", line 91, in ?
    main(src_base, out_base, files, outfile, showasm, showast, do_verify)
  File "D:\decompyle-2.3\decompyle\__init__.py", line 189, in main
    decompyle_file(infile, outstream, showasm, showast)
  File "D:\decompyle-2.3\decompyle\__init__.py", line 129, in decompyle_file
    version, co = _load_module(filename)
  File "D:\decompyle-2.3\decompyle\__init__.py", line 72, in _load_module
    marshal = marshal_files.import_(magic=magic)
  File "D:\decompyle-2.3\decompyle\marshal_files.py", line 29, in import_
    locals(), 'decompyle')
ImportError: No module named marshal_20

请问是怎么回事啊，这个marshal_20我搜索了一下没有找到。
不过在D:\decompyle-2.3\decompyle\下有个marshal_22_for_20.c文件

我在windows XP、windows 2000下用python2.2和python2.4都试过了。

请高人指教，谢谢。
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