[Mimedefang] bad_exts in zip files

[MAYER Hans]

Dear All, 

Mimedefang version: 2.79 
In file "mimedefang-filter" there are several extensions listed in $bad_exts 
They are all caught if such a file is sent as attachment and moved to a quarantine directory.
There is also the feature "Archive::Zip" 
If such a file with a bad extension is inside a zip-archive most of them are removed but some of them not. 
Any idea why this could happen ? 
Is this a well-known bug of my version and should I upgrade ? 


Kind regards 
Hans