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Martin,

Thank you for investigating this. It seems to me that my original patch should 
be save then, it sets the creator_system to unix on unix-y systems only. 

The current version of zipfile sets the higher 16 bits external_attr to the file 
mode as returned os.stat and doesn't set the lower bits at all (the comment 
mentions 'unix attributes').

As you already noticed zipfile doesn't set any other attributes, such as user 
and group, and IMHO that wouldn't be very useful for most usecases anyway.