Have you tried Souplk, a utility to en/decode MIME headers and
message bodies to/from quoted-printable? A sample of how it works you
can find in my "Organization" header :)  (it's in Polish).
Souplk can be downloaded from:
      ftp://ftp.mimuw.edu.pl/pub/users/keplicz/piotr/souplk.zip
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   | . ) |/ /      ------    Piotr K=EAplicz    ------      \ \| ( . |
   |__||_|\_\    http://rainbow.mimuw.edu.pl/~pkeplicz    /_/|_||__|