Rob, you are a goldmine, and so helpful!
I've found the "pbfwsplit.pl"
here:
http://ava1ar.views.fm/pocketbook
I think this must be a page mantained by a user on the Russian forum, ava1ar (the one with a bird as avatar), and as it has got load of stuff I leave the link in case it may be of use to you guys who know what to do with those utilities
Can't wait to play with this tonight, agin many thanks!