>SET PATH TO "c:\mytestfolder"   && Where myconst.h file is located
>
>#include "myconst.h"
>
>messagebox(A_CONSTANT)

>
>it says it can't find the constant. Now help says that #include uses the SET
>PATH setting to search for any header files and that is what has been
>throwing me.

If you do

#INCLUDE myConst.h

it should work correctly.