I did need to do two things.
I added a new Wine Drive with the same letter that is registered in the ini. (in my case F) with the BGII installation directory as its mount point.
and secondly, the wine command is a bit funny if you dont terminal to the directory manually.
in my case it is:-
wine start /Unix "/home/paul/.wine/dosdevices/f:/Games/BGII - SoA/BGMain.exe"