[Zope] structured text nonascii-characters, umlaute

Dear List, I am starting Zope 2.4.2 on win98 like so: "J:\Zope\ZopeSite\bin\python.exe" "J:\Zope\ZopeSite\z2.py" -D -L "german" %1 %2 %3 %4 %5 %6 %7 %8 %9 and refer to structurd text like: <dtml-var stxTest fmt=structured-text> but the umlaute like ä, ü, ö and other non ascii-characters are not rendered properly. Does anybody know what to do or where the problem might be? Thanks for your replies, Elena