The original names are: "Hübsche Tagebucheinträge" and "RGB äöüæÆÜÖÄ.txt". In GNU Emacs 24.0.50 the problem is solved, even decomposition of accented characters as in Apple's HFS+ is solved.

--
Greetings

  Pete

     _o    o         o   o
   _<<     \\_/\_,   \\_ \\_/\_,
  (*)/(*) (*)   (*) (*) `-    (*)