Last week, Microsoft announced that the Xbox Wireless Adapter for Windows now supports Windows 7 and 8.x. Previously, the dongle would only work on Windows 10, which meant that other operating systems required Xbox One controllers to be wired.
This does not mean that all functionality will be available on Windows 7 and 8.x, though. The Xbox Accessories app is required to manage profiles and update firmware without an Xbox One console. As far as I can tell, that will continue to be the case. If you have an Xbox One console, and don't mind managing the controllers there, then this wireless adapter might be for you. If you have don't have an Xbox One console, Windows 10, or an existing Xbox One controller, then you may want to reconsider getting an Xbox One controller at all. If you do, then you can turn it wireless, now even on Windows 7 and 8.x.
The Xbox One Wireless Adapter for Windows has been out for a couple of months.