A refresher of the file access model in the Windows Runtime and an overview of new functionality in Windows 8.1. Focus on interacting with user data using the example of a Photo Viewer app. How can apps consume files through capabilities and pickers? What changed in Windows 8.1 based on developer feedback? Describe how to use the file activation extension to provide seamless navigation of neighboring files within a view. Provide guidelines for interacting with files from SkyDrive online or offline, and displaying them in app UX.