Well, as the discussion went in the other thread even configuring 32bit xp mode didn't solve it. You may try anyway and turn both foxprox.exe and foxpro.exe and your own exe this way.
But this is a dos app, and win7 is not dos.
Try running C:\Windows\SysWow64\cmd.exe and then start your app from that 32bit command prompt.
Bye, Olaf.