Microsoft published a blog post today confirming that developers can now offer ARM packages to the Windows 10 desktop device family. The company also noted that it's recently added the ability to offer an app to Surface Hub users, which runs a variant of the OS known as Windows 10 Team.
The way that UWP works is that it's one app that works on all device types. With responsive design, the same app can run on a phone, a PC, or a gaming console. And with the addition of the Fluent Design System, the same app can be run in 3D environments as well, such as Windows 10 Holographic and Windows Mixed Reality.