Yes... If I remember we were aiming for the newly released "Windows 8"-based Phone OS, and the previous version was fully incompatible with it so all apps had to be redone. Tiles were the new thing to build for.
Amusingly Microsoft is still trying to make the walled garden happen. Lots of cheap Windows laptops and Desktops ship in what is called "Windows S" mode where only Microsoft Store apps are allowed to run. But again because PC owners don't abide that kind of bullcrap they also have to supply a way to tear down the walls (it's surprisingly easy, albeit permanent: just download and run a free app from the Windows store) if you want to use the machine in a normal way.