Basic Lisp call function (Path trouble)

Hello all,

I'm new to Lisp and an having a basic problem calling and running a program within my application.  My below code
example correctly runs I assume due to the open paths within windows allowing the volume control program to run when
called.  But I need to run "C:\Program Files\Any Program\anyprogram.exe".   So the handling of the path has been my
current problem.
I've attempted varied commands, but I'm certain this is a simple thing I'm missing

-----excerpt from a voice recognition routine--(code is good)------
((string-equal *text-phrase*
                     (concatenate 'string robot " volume control"))  ;utility
  (setf *text-phrase* nil)
  (system:call-system "sndvol32.exe" :wait nil))

Thanks for the advice
Dan Smith
www.ayso574.org/halloween