[h-e-w] Powershell with non-ascii characters in emacs

[Martin Stemplinger]

I use Dino Chiesa's powershell-mode (see
http://blogs.msdn.com/dotnetinterop/archive/2008/04/10/run-powershell-as-a-shell-within-emacs.aspx)
to run powershell as a shell within Emacs on Vista and it's another
good reason not to leave Emacs. 

But (being German) I need to use non-ascii characters like äöü in
strings in my powershell work. These somehow get scrambled and end up
not correctly in the powershell code. I played around with some
settings of the coding systems but have not been successful. Any
hints?

Thanks in advance!
Martin