how do I forward as attachment with attachment in plain text form.

I am new to outlook, previously using outlook express. I need to forward a
message as an attachment in plain text format, which I could do in outlook
express, but I can't find a way of doing this in outlook. The message gets
returned to me as being incorrect when I try using paper-clip drop down to
forward email, and use email address in address book to assign all messages
to this sender as to be sent in plain text. I assume it's not sending the
attachment in plain text, which is what I need to do. Any ideas?
Thanks