[RedDevil]

Ha, I actually tried that myself.
All you need is two wheels on an axle and a rope wound up on the axle.
Yes, it definitely works; it is not a trick.

On the cart the rope winds itself up on the axle.
It still gets pulled forward because the rope still moves forward (albeit slower than the cart).
The forward pull on the axle is stronger than the resistance it meets from the wheels, as the axle has a smaller diameter than the wheels so it rolls up the rope more slowly than the forward motion.

Likewise, the surface the blades of the propeller provide moves with the wind but more slowly than the car. Hence the wind is still able to blow against it.
And just like the axle winds up the rope slightly, the gears move the propeller against the wind slowly.

I did a step by step explanation in this post.
If you are still convinced this faster than the wind car thing is impossible or if you don't see how it works, please do go through those steps and tell me which of them sounds wrong.