The suggestion doesn't work I'm sorry to say. This came in this evening:-
Very suspicious extension of attachment
* http___www.aiscl.co.uk_DownloadAISBackup.htm - {42D36796-18CB-4AC5-B25E-E92AFF5724B1}.diff.html.20050106203357.mht
Sender: Timely Web <timelyweb@valencia.plus.com>
Recipient: email@valencia.plus.com
Subject: Web Page or Software Updated
It is a legitimate e-mail that I want to receive. If there were a way to disable scanning of .mht files (it worked in BitDefender 8 [my previous virus scanner) it ought to solve the problem.