selection box, if specified. If MUSTMATCH is non-nil, the returned file
or directory must exist.
-This function is only defined on MS Windows, and X Windows with the
+This function is only defined on NS, MS Windows, and X Windows with the
Motif or Gtk toolkits. With the Motif toolkit, ONLY-DIR-P is ignored.
Otherwise, if ONLY-DIR-P is non-nil, the user can only select directories. */)
(Lisp_Object prompt, Lisp_Object dir, Lisp_Object default_filename, Lisp_Object mustmatch, Lisp_Object only_dir_p)