Hello Tom, I managed to compile the DynPersist.c that is needed for ZPatterns on W95 using the instructions at: <http://starship.python.net/crew/kernr/mingw32/Notes.html> Some Setup modification may be needed. In my case: *shared* DynPersist DynPersist.c -I../../ZODB -I/zope/zope-2.3.1-src/lib/Components/Extension Class Zope sources have to be available. Regards, Jan