Outlook doesn't see clearly attachment of a forward mail

[Lezius]

Hi

I've recieve thru a mailing list a mail which was forward
with its attachments.
The probleme (on my computer, the other of the mailing
list doesn't have this problem) is that all the forward
step and file are put in a big one attachment.
This attachment is no longuer readable. When I save it and
edit it, it's look like an e-mail with headers, body and
attach files.

How can I configure my Outlook to correctly see the
attachment plz.