Try adding quotes and semi-colons, as in:

SET PATH TO "reports;forms;libs;graphics;menus;data;include;progs"

>I'm putting SET PATH TO reports, forms, data, in the .prg that I have set as main. It reads like this:
>
>#INCLUDE [..\DA_APP.H]
>
>SET PATH TO reports, forms, libs, graphics, menus, data, include, progs
>DO mainmenu.mnx
>
>.....
>
>After compiling, I get the error mainmenu.mnx does not exist, but the file is in the Menus directory.
>
>What am I doing wrong?