βNormalβ Windows applications can still work fine in desktop mode. In fact, if you have such an application, it will most likely work just like in Windows 7, and you really don't need to feel the pressure to create the Windows Store application (formerly known as Metro).
The question that you linked to talking about something completely different, however. It is designed to build applications like Zune or the Github Windows client in WPF. They have a certain aesthetic similar to Metro, but they are not really Windows Store apps. You cannot use WPF to create the latter, although most of the key concepts are similar or identical.
Joey
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