I use kixwin to open an explorer window. http://kix.isorg.net/kix_tools/
here is my used code,
RUN '%comspec% /c kixwin "\\server\netlogon\test.html" "" "dialogWidth:800px;dialogHeight:600px;edge:raised;help:no;scroll:no;status:no;unadorned:yes"'
with the run command the script continu loading you can replase it with the shell command then the script waits until the window is closed.
in the test.HTML I used a timer to close the window after 10 seconds this code is at work but when you need it mail me.

GR peter