title: zipfile cant handle some type of zip data?
body: <p>I came up over this problem while trying to decompress a zip file.</p>
  <p>-- <code>zipfile.is_zipfile(my_file)</code> always returns False, even though the UNIX command unzip handles it just fine. Also, when trying to do <code>zipfile.ZipFile(path/file_handle_to_path)</code> I get the same error</p>
  <p>-- the <code>file</code> command returns <code>Zip archive data, at least v2.0 to extract</code> and using <code>less</code> on the file it shows:</p>
  <pre><code>PKZIP for iSeries by PKWARE
   Length      Method Size      Cmpr Date       Time  CRC-32    Name
   2113482674  Defl:S 204502989  90% 2010-11-01 08:39 2cee662e  myfile.txt
   2113482674         204502989  90%                            1 file
  </code></pre>
  <p>Any ideas how can I go around this issue ? It would be nice if I could make python's <code>zipfile</code> work since I already have some unit tests that I'll have to drop if I'll switch to running <code>subprocess.call(&quot;unzip&quot;)</code></p>