https://bugs.winehq.org/show_bug.cgi?id=37777
--- Comment #8 from super_man@post.com --- According to this link
https://technet.microsoft.com/en-us/library/bb491009.aspx
taskkill /t means
"Specifies to terminate all child processes along with the parent process, commonly known as a tree kill. "
There has been no work towards this that I am aware of.
wine 1.9.2