Windows Setup Guide - vanilla-wiiu/vanilla GitHub Wiki

Vanilla officially supports Windows, but only as a frontend. This is because there is currently no established way to achieve the necessary 802.11n PTK rotation necessary to connect as a gamepad to the Wii U on Windows.

Therefore, a Windows frontend must be accompanied by a compatible pipe. It is recommended to run Linux and vanilla-pipe in a virtual machine with direct hardware access to a compatible wireless adapter. More information can be found on the Pipe page. It may also be possible to do this via WSL, but it has not been tested yet.