In an attempt to keep this thread on topic, you could have tried asking in the forum for the sdk. Ian, the creator of the program frequents the forum, a lot, and you will get a response either from him, or someone close to him. You'll probably get the official stuff plus some help from them.
I personally love XMPlay and use it everywhere, and while the winamp plugin works well enough, having a proper native plugin will be even better, so thanks for the effort :D.