Launch Metro style apps using powershell

I am trying to write a powershell script for windows 10 that will automatically launch a Metro-style app.The Start-Process cmdlet seems like it should work, but I cannot get it to launch anything unless I provide a path to the .exe

For example, the following input works:

    Start-Process 'C:\Program Files\Internet Explorer\iexplore.exe'

Unfortunately, Metro-style apps do not have an executable file. What file do I need to use to launch them?If I wanted to launch Windows Store for example, how would I do that?

Thanks