Sailwave Files and Server 2003 Offline Files

I use sailwave on a laptop that synchronises with a windows 2003 server.

During the synchronisation process, all the sailwave files have been
converted to folders (or that's what windows thinks) and renamed them
from .blw to .bl~

I have tried the obviuous move of renaming them back to the original
but it has no effect.

Before I completely re-do all the scores, has anyone else come across
this?

regards

Ian