We’re going to be releasing a lot of documents soon and it’ll all be in .XPS format, among other things. In order to view .XPS documents, download the WinFX Beta components here:
Additionally, you’ll need to download the WinFX updates here:
If you want to uninstall the WinFX runtime components, you may need to download this to do it. Try uninstalling them through the Add/Remove Components area first.
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Kurt Shintaku's Blog 