Jeroen Dobbelaere <jeroen.dobbela...@gmail.com> added the comment:

Some more background:
The actual issue was initially detected when observing that the 'tarfile' 
package produced a tar containing different permissions, depending on the 
script being executed by 'cygwin python' or 'native python'.

When using native python to do the 'untar', I did not observe any issue (as it 
seems to automatically add 'read and execute' for all files).
But, when I used 'cygwin tar', the .dll did not get its 'read and execute' 
permission (as it was not specified in the tar file), which then resulted in 
program that crashed (with a very unhelpful message). Allowing 'read and 
execute' manually resolved the crash.

So, although this permission should not mean anything, it does seem to have 
some influence :(

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10888>
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