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A PDB file is required for debugging crash dumps from 
complex pythonic programs. This ability is absolutely 
critical for commercial programs using python. Technically, 
the crashes only happen within pyds or dlls, but it is 
often very vitally important to be able to find out what 
python code was being interpreted at the time. 
Unfortunately, I've even seen "pure" python crash in one of 
the supplied pyd's. Of course, the pdb file should be in a 
separate download, as few users require the ability to 
reverse engineer crash dumps.