So has anyone found a bluetooth adapter that allows you to use Wii Motion Plus and the Toshiba Stack with Windows 8?
I ended up wasting money on the Kinivo BTD-300 due to it being the only one listed as being a compatible bluetooth adapter for Windows 8. The problem is that it only seems to work with the regular Wii remote (which I do not own) and it does not work with the Toshiba Stack, which apparently is a requirement for the Wii Motion Plus to work with Dolphin.
I can't guarantee this will work, but it did for me with an adapter so old that I can't even figure out the model of it:
1. Get the hardware ID of your adapter in the device manager.
2. Go to Program Files (x86)\Toshiba\Bluetooth Toshiba Stack\Drivers\tosrfusb and open tosrfusb.inf.
3. Scroll down until you see the devices listed like this under [Standard]: "%TosrfUsb.DeviceDesc1%=TosrfUsb_Device, USB\VID_08EA&PID_abba".
4. Replace one of the device IDs with your adapters ID, then scroll down to the [Standard.NTamd64] section and do it for the same device # there.
5. If you want, you can set the device #s name even further down.
Again, I can't guarantee this will work for you, but my Skyward Sword Wii Motion Plus works flawlessly this way.