it maybe a setpath problems? You may need to look in the mamewah log file, what it has tried to run.
I guess the wrapper diddent could find the actuelly game, because it started with a wrong start path (a typical problem, wich chaused my own jukebox software too). Hince it open the wrapper gui.
Instead you may try to create a bat file, and type this into that:
c:\
cd C:\Pinball Game\
; Your wrapper file
launcher.exe
You should of course let the shortcut point into the new bat file.