The invention relates to a motor vehicle widow lifter, comprising a twistable or bendable guide rail 3, on which a driver that can be coupled to a window pane is slidably mounted and which has fastening points 51 which can be connected to fastening receptacles 41 of a carrier element 2. At least one support point 61 is provided between the fastening receptacles 41 of the carrier element 2. When the fastening points 51 of the guide rail 3 are braced to the fastening receptacles 41 of the carrier element 2, the guide rail 3 is supported on the support point 61 and the initially straight guide rail 3 is twisted with a predetermined degree of twist and/or the guide rail 3 is bent with a predetermined bend radius R.
