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If you’re going to write Windows Store apps, you’re probably going to need to know how to use the Windows Runtime API to access storage folders and files. This video explains the object model and how to access read-only and read-write package files. It then introduces pickers and demonstrates how they’re used to access user files. It then goes into file type associations, file properties, and thumbnails, and concludes by showing how to implicitly access user files and perform rich queries over the folders containing them.