PDP11GUI under Wine on Linux -- extra backslash?

[Fritz Mueller]

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.