My favorite example of that was when WinRT app .exe files could not be launched from the command line. Only via some Windows Store voodoo dance with approvals, signatures and "security" that made WinRT for developers essentially a dead-on-arrival technology.
I would not be surprised if you still cannot launch a fricking .exe.
This was sorted out in Windows 10 with the unification of WinRT programming models under UWP.