Just after posting the original message, I got an e-mail from the Danish colleague. The problem seems to be with a wmf graphic file:
"I cannot save it on my computer...When I right-click at the link and try to click at "save target as" it tells me that my "Logon is refused"... When I...left-click...the link I can open the file and see the picture..." The simple solution is to convert the file to another format. But since I already posted the question, can anybody offer an explanation? Menahem Rosen Technical Communicator