[Zope] How modify *path* of a 'zope instance home' ??

I tried modifying paths to 'zope instance home' in bin/runzope, bin/runzope.bat and etc/zope.conf. I also tried just doing a symbolic link from old path to new location of 'zope instance home'. NOTHING WORKS!!!! I get errors about Zope/Plone not being able to load Archtypes product. **Is the old zope instance home _path_ burned into a binary somewhere that cannot be changed??** e.g. Does Data.fs depend on old path somehow?? HOW CHANGE PATH OF ZOPE INSTANCE HOME??? Chris