#917 DOMAIN\USER formatted usernames are not displayed correctly in window title

[Cthulhu]

I'm using icewm on a openSUSE13.1 terminal server with tightvnc as vncserver. The Clients are authenticated by an Windows Active Directory. Thus we have usernames like DOMAIN\username
Fur usernames starting with the letter "f", the User name in the window title of icewm windows is not properly escaped. E.g., user "frank" has the string "DOMAIN?rank" in the window title.
IMHO the username is not escaped as a string, but gets interpreted somehow.
Other usernames, e.g. starting with letter "w" are displayed fine.