Current Windows backend is WinAPI based.
There is also an alternative - WinRT API, and it actually uses a different implementation.

More discussion about it: #282.
Having an alternative backend might be useful in the future. Leaving this ticket to follow up on it if someone ever gets to finish it.
Some attempt to move in this direction:
https://github.com/LeeChunHei/hidapi
UPD: see next comment.

A general recommentation is to have this backend implemented in C++, due to way simpler implementation, when it comes to WinRT, compared to C.