http://bugs.winehq.org/show_bug.cgi?id=7627
------- Additional Comments From lich@math.spbu.ru 2007-23-03 10:10 ------- Does your Z: point to home drive?
Try to run: wine "Z:.wine\driver_c\Programme\Microsoft Office\Office\WINWORD.EXE"
Just interesting, what will be result? I suspect WinWord checks the directory it lives in.