Motor vehicle with open rigid roof

The motor vehicle has a support arrangement with a support that enables a rear window (16) to be acted upon by a rotational force to ensure contact of the rear window with a sealing seat. The support is pushed forward to enable the rear window to be acted upon by the rotational force. Independent claims are also included for the following: (a) an openable fixed roof for a motor vehicle; (b) a method of making an openable fixed roof for a motor vehicle;and (c) a method of operating an openable fixed roof for a motor vehicle.