I'll have a look at the Bentley Viewer. We actually still have VoloView, but we're using acad 2004 now...
We also have a different system in place, but this guy just doesn't seem to want to use it. DrawingSearcher automatically creates up-to-date dwf files each time a drawing file is modified and the searching capabilities are outstanding, but I can't get this guy to use it for some stupid reason.
Anyway, I'll give it a go and we'll see.
Cheers!