As a rule of thumb, ext warranty (even the best one) does not cover "tear and wear" items - rubber stuff (tires, tubes, belts, etc.) - but gasket is covered. - suspension components - battery - bulbs (even the dash backlight - but LCD display is covered such as the one commonly used for clock) - CAT converter etc. I had ext warranty on my old BMW for 7 yr. As a general rule to expect about 50% cost is covered among all repairs (BMW is buggy). $0 deductible is possible with certain rules applied. Bumper-to-bumper coverage is near impossible for ext warranty.
Well, I confess that I never did get the window fixed. It still made me mad that it was not covered so I guess I did the ol' "cut my nose to spite my face" kind of thing. Then one day a couple of weeks ago I plugged something in the power outlet and blew a fuse. Before I fixed the fuse, just for the fun of it, I tried the switch and the window now works! It has worked every day since then. Now I'm glad I didn't get it fixed. I don't know if when I blew a fuse, it made the power switch work or if it didn't have anything to do with it. But anyway, it now works and I'm not looking a gift horse in the mouth! Thanks everyone for your support.