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I want to know how to customize a single tile, not all of them whole sale.

So

How do I change the pictographic representation of a win32 application in the metro start menu? Right now nearly all my win32 apps are getting a generic white window floating in the corner of a blank metro tile (I assume because they are network applications). Some get the real icon but still just the icon floating in the corner instead of displaying the high res version of the icon as the tile itself.
How do I change this? And can I change it in an installation routine? (what code/API do I need to do that?)