>It comes as an attachment to a government body - so it looks kosher
>
>When opened it destroys dbfs (subsequently they appear as "not a table" and excel spreadsheets
>
>Everything else it leaves untouched
>
>Our anti virus is AVG - any know of an AV product which would pick this up or the si called Blackmail virus?

AVG has served me very well. After a nasty virus destroyed my C: drive a few years ago I installed AVG and have not had any problems since. Maybe part of it is I have become very cautious about downloads.