def set_guid(self, value):
        raw_bytes = UUID.get_bytes_le(value)
        p1 = raw_bytes[0:4]
        p2 = raw_bytes[4:6]
        p3 = raw_bytes[6:8]
        p4 = raw_bytes[8:16]
        self.reader.set_raw_header_property("proj_id_1", p1)
        self.reader.set_raw_header_property("proj_id_2", p2)
        self.reader.set_raw_header_property("proj_id_3", p3)
        self.reader.set_raw_header_property("proj_id_4", p4)

        '''Sets the GUID for the file. It must be a :class:`uuid.UUID`
        instance'''
        return