Help need for reading saved messages?

There was a time when I could just go into "My Received Files" and read a
message that I had saved(the message was clear and easy to read, as if it was
in the style of the MSN messagers lay-out), but now if I try to read a saved
message it looks all gobblety-gook to me; example:-
"?xml version ="1.0"?
?xml-stylesheet type='text/xsl ' href='MessageLog.xsl '?
Log FirstSessionID="1" LastSessionID="1"Message Date="04/03/2006"
And, so on.
So could some-one please, please help me!!!
To solve my little problem of understanding what has happened(or what I've
done to my computer), and how I can correct it?, so messages can be saved in
a easy readable format!!! Thank you very much, to any-one who can
help me!!!

John