I sincerely doubt if WinRT apps (which are sandboxed) can instantiate or launch PowerShell.
Loading User Information from Channel 9
Something went wrong getting user information from Channel 9
Loading User Information from MSDN
Something went wrong getting user information from MSDN
Loading Visual Studio Achievements
Something went wrong getting the Visual Studio Achievements
I sincerely doubt if WinRT apps (which are sandboxed) can instantiate or launch PowerShell.