Reinstall Metro apps?

I wonder what the best way is to reinstall a Metro UI app? I am thinking of the Metro UI Wikipedia app. It recently started crashing at start up, but had been working just fine. On the iPad, uninstalling and reinstalling an app, is the way to clear corrupt settings. On Android there is a clear settings function. I am not clear how to do this with Windows 8 Metro UI.

Also I checked the registry. It doesn't seem like Metro UI apps use the registry. I was hoping to delete some settings in the registry.

Bottom line: I am curious how to get the Wikipedia app to come back to life.

If you right click a metro app tile (checkmark it) you should see an uninstall option on the toolbar that pops up from the bottom of the screen. Then just go to the app store and install it again.

http://www.eightforums.com/tutorials/5278-apps-uninstall-metro-apps-windows-8-a.html

and

http://www.eightforums.com/tutorials/5270-apps-install-metro-apps-windows-8-store.html