PDP11GUI under Wine on Linux -- extra backslash?

So, I am trying to run PDP11GUI under Wine on Linux, and I am having problems loading a machine description file. It seems when PDP11GUI tries to kick off M4, it is expanding an extra backslash into the command. So you get this sort of error message (note extra backslash before m4.bat): Can't recognize 'C:\Program Files (x86)\Joerg Hoppe\PDP11GUI\\m4.bat" "C:\users\Public\Application Data\PDP11GUI\machines\pdp11.ini" "C:\users\fritzm\Temp\tmp_pdp11gui_m4_out.ini' as an internal or external command, or batch script. I've verified that I can run m4.bat sucessfully manually if I set the appropriate env vars first. But this doesn't help because it seems like PDP11GUI deletes the file and then (fails to) regenerate it on each run :-( Anybody else run in to this or have a suggestion for a workaround? thanks much! --FritzM.