ResEdResource files are edited using the application ResEd (available from the AppBasic downloads page or from RISC OS Open)
Editing resource files
Adding templatesTemplates are added to a resfile by dragging from ResEd's Object Prototypes window onto the file's display.
Adding a template of class 'Window'
Editing templatesA template is edited by double-clicking its entry in the ResEd display. This opens an edit dialogue box except in the case of windows and menus where a representation of the object is displayed; see User Interface Toolbox for the details.