On the front doors there are two screws, one at each end that have to come off in order to remove the trim. The upper edge of the trim is lipped at the window opening and if memory serves is held in place by the same fasteners that hold the cats whiskers.
The rear doors have three screws. The third is in the center and is accessed by reaching in thru the inner door opening. I think I had the glass out which made access much easier.