[Zope] copying Data.fs

I'm trying to move a site from Linux to Win2000. Zope is installed and running on both. I shut down both zope servers. I copy the Data.fs file. I start up the Win2000 Zope server. It give me an error. Are there special tricks involved here? I haven't found documentation on platform migration...is there any? I'll send back more detailed error messages/logs if I'm following correct procedure. Don