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as Photoshop, Firefox, or Libre Office that's made by a third party for use on a desktop only when they get around to making one that will work well on the Metro UI?

We already know they won't be able to be run on the ARM devices as they'll require too much in the way of resources, and it's most likely, especially for Firefox and Libre Office, that they'll be made available through their own website and not the Microsoft Store. Do they cease being an app because they aren't sold through the store?