Opening emacs from bat file fails on path with unicode characters

Hi

I am trying to automate emacs opening with a batfile.
This
"..\emacs-24.3\bin\runemacs.exe" -l ../emacs/default.el 
--find-file=../simul/hello/hello.dna
if the path to emacs-24.3 is only ascii characters.

If the path has unicode characters windows closes emacs with "A fatal 
error has occured". Is there a way to avoid this?

Brian