Abstract: A folding door apparatus for homes and other building structures that is formed of a plurality of panels hinged together in accordion fashion. The door panels are raised and lowered along parallel vertical rails by a pair of winding reels and cable. A stability pin and a plurality of guide pins extend from the outer side edge of selected panels. The rails are hinged to the structure's flooring, and define an inner and outer trackway. The inner trackway for receiving the stability pin, and the outer trackway for receiving the guide pins. The inner trackway further defines a release point at the approximate midway of the length of the rail. In application raising the door panels to an open position, the stability pin remains engaged within the inner railway until stability pin is raised to the release point. At release point the stability pin is disengaged from inner railway for proper folding of the panels.