> It's possible: you should follow quoted-printable-decode-region with
   > decode-coding-region, and pass it a suitable coding-system.

Right, thanks I did that and indeed it was utf-8.

   > You will have to guess the encoding somehow.  Emacs cannot (and
   > shouldn't in this case).

Ok, but it is good to know, that it is not obvious and one should play around.