strange content type handling

[Jack <ostroffjh users sourceforge net>]

For the past few days, messages from one particular person to the  
cygwin mailing list have shown up in my inbox as "Type: unknown  
(application/octet-stream) with only the offer to Save part.  The  
source shows "Content-Type: application/octet-stream".  What is  
particularly odd is that if I select a different message, and then  
select the first, it says "Type plain text document (text/plain)" with  
the offer to save pare or open with KMyMoney, which is a finance  
program, and not a text viewer.  The sender says "I am using non  
standard Content-Type: text; charset=UTF-8" but nobody else on the list  
has said anything about problems with his messages.  He will change to  
text/plain, so I don't foresee further problems, but I'm really curious  
if anyone has any thoughts about what's been going on.

Jack