Works perfectly on Windows 7 64bit if installed correctly.

The adapter comes with a CD in which only the 32bit drivers are present. However, downloading the application dedicated to the controller at Microsoft [...]
The driver is installed. it is sufficient to force the adapter installation by going to the Device Manager
Right click the unsupported adapter (with an exclamation point in a yellow icon)> Properties> Driver> Update the Driver> Search on my computer> Select from a list of device drivers on my computer> uncheck Display compatible hardware> Select Microsoft as manufacturer and driver Xbox 360 Wireless Receiver for Windows.
Ignore the windows that you do not recommend the activation of the driver is the trick.
Once recognized, the adapter behaves exactly like the official adapter. It can connect up to 4 wireless controllers Xbox 360.
Great product if you put a little hands in the camboui. If the procedure scares you, prefer the official version, more expensive.