All the play and charge kit does is provide power, and let the 360 know that its plugged in, so that when you turn off your xbox with the pad plugged in, the fans and power stay on so it charges the pad.
The Pc recognises that there is a device on the other end of the lead, but it is only because of the above reason.
I'm pretty sure there's drivers for it. They make a version for the PC which is identical to the 360 joypad. I think I've seen drivers for it floating around the web - there's a driver to get it working on Macs as well (I think)
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