[Zope] Distributing product "unmangled"

I have no problems "distributing" a product. My only problem is that my "test-x.x.tar.gz" contains __init__.py product.dat version.txt while all other products that I have downloaded so far contain the "raw", "unmangled" material, e.g. __init__.py addRedirector_form.dtml manageRedirector.dtml VERSION.TXT ... What am I missing (and how do I get rid of this "mangling")?