Windows 8 getting a built-in PDF reader, Metro-style
From the handful of screenshots Paul Thurrott has shared, it's clear that Modern Reader has been built with Metro in mind. You can see the Reader back button in the top-left corner of the yellow image and the minimal page navigation bar on the right. We've posted some larger images we managed to scrape from Google's cache after the break.
Thurrott also mentions that Modern Reader is the first program spotted which is built using AppX -- a packaging technology that may allow developers to roll a single build to both Windows 8 desktops and Windows Phone 8 mobile devices.