When Microsoft announced earlier today that universal Windows apps could run on the Xbox One, it seemed pretty...self-explanatory. A developer could easily port any Windows or Windows Phone app over to the Xbox for you to use on your TV. Right? Not exactly. Here at Build, we had the chance to sit down with Steven Guggenheimer, corporate vice president in the Developer Platform and Evangelism group, who gave us a little more insight into how this universal app thing is going to work on Xbox.