Removing the window channel strip on the outside of the front door

NOTE: Description is for left component only. Procedure on the right side is identical.

Insert the special tool 0 495 484 (00 9 324) at the front (on A-pillar) into the window cavity and slide it toward the back.
Position the special tool 0 495 484 (00 9 324) as shown at the lower edge of the window channel strip (1) with the short shank (2).

Courtesy of BMW OF NORTH AMERICA, INC.
Position the special tool 0 496 570 (00 9 326) on the door trim panel (1).
Use a suitable tool (2) through the opening of the special tool 0 495 484 (00 9 324) to lever out the window channel strip (3) toward the top no more than 5 mm.
Gradually shift special tool 0 495 484 (00 9 324) and 0 496 570 (00 9 326) forwards until the window channel strip (3) has been completely disassembled.

Courtesy of BMW OF NORTH AMERICA, INC.