An airbag apparatus in which a front portion of an airbag is inflated earlier than a rear portion of the airbag. The microwave oven further includes a steam guide passage which is provided in the cabinet to guide steam generated from the steam generating unit into the steaming unit. The one-way rolling member is set on the rotation axis. The conveying device may also drive the blow-by gas in the crankcase ventilation device. Formed in the driving gear is a cavity having a substantially radially extending wall which, in the installed state, is opposite to a protrusion which projects into the cavity and is rigidly connected to the housing, the wall of the cavity and the protrusion forming part of a wall of the pressure chamber. In such an embodiment, the file header includes a pointer to the file data and thus, the inclusion of the access rights information into the file header does not disrupt the processing of the file.