These commands apply only when only files are selected.
Change Creator from … to
Select an item from this submenu to change the creators of all the selected files to that in the menu. The contents of this menu are the same as those used by the Info window’s creator pop-up menu.
Change File Type to
Select an item from this submenu to change the types of all the selected files to that in the menu. The contents of this menu are the same as those used by the Info window’s file type pop-up menu.