Thought so, I assume that the adapters work off blue tooth but the adapter also converts the output of the receiver to that of a wired Xbox controller. So that if the commands were to be received by a normal blue tooth device, it would be gibberish.
Why can't MS just build the converter into the controller in the first place? Because that would be to easy... and raise the cost of the controller by ~$15.
As a PC user I demand that Xbox users have to be put of pocket for the benefit of PC people! j/k