Rear window replacement?

Somebody correct me if this is wrong... Unzipping the plastic backlight is not absolutely required before lowering the top but where a hard backlight is present you must unzip it before lowering the top. The 2 snapped straps catch it so it doesn't drop far, just enough to prevent busting the zipper.
And yes the backlight's surround is stapled in where the top is so it all needs to come apart from the dutchman panel to the rear most cross bow.