Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=56940
Attempt to fix the regression caused by 0bad544aab9e2c9ee93bbabac0386e02c58a39c0. Unfortunately the author of that patch doesn't seem to be active anymore, so here's an attempt, with the remark that I don't know why it worked before that patch, and I'm not sure sure if this is the correct way to fix this.
The only thing I know for sure is that on windows one can start an app via ShellExecuteW with a trailing space, and in wine this doesn't work anymore, and it did work before that commit.