Briefcase Replication

Win98FE laptop attempts to synch documents to a fully shared/with full permissions directory on an NT4.0 SP6a server via Briefcase. Some Briefcase directories, and the material in them will synch, some will give error and not synch anything within the directory. The error is
"<filename.xxx> Merge Handler cannot be loaded".

I have scoured Technet and found nothing relavent to this, or anything even close :-(
This is my first foray into the Windrivers Forum. Can anyone help??
Regards.
:confused: