Yeah since Action Camera came out, I really don't have a need for it. It does everything the GoPro app does... probably also not giving GoPro a lot of incentive to develop their own app.
I would still like the more official version from Nokia. There's seem to be the best when completed. At least in my opinion. I hope it gets released soon!
I do not know if there is cdurrently a app being created for windows based platforms. There are some third parties which are developing apps for the devices. As of right now GoPro has not released that they will create an app for windows.
Please let us know if you have any further questions.
Yes the official app is so much more stable than the others. Its just head and shoulders better than the rest. At least for me. I run a Lumia 920 with a gopro black edition. I say get it while its good