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> Because Windows and Windows apps don't support resolution-independent UI scaling.

If I'm not mistaken the new, formerly known as "Metro", UI is vector based and any applications built with the WPF which includes all Windows 8 GUI based applications (at least the non-html one's) are of course vector based so it's simply up to the designer/developer to scale it however they want.

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Not completely true. The metro app developer will still have to include pixel art at varying resolutions since these do not scale automatically very well.

unless you develop metro apps using javascript/html - then you can use vector art.

XAML is very vector orientated, most apps will (should) not include pixel based art-work unless really necessary.

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