Created attachment 40175 [details]
A file showing the problem
When creating any document stored as a zip, the zip structure isn't valid: the number of local headers and central directory headers aren't matching.
Attached is a document showing the problem. The zlib version on my system is 1.2.3-140.2 on OpenSuse 11.2.
Hum... in fact the test tool was wrong: closing as invalid.