Let’s imagine that we are creating a Metro style text editor. With help of the pickers users are able to open and save files at any location. But what if the user wants to reopen a file he or she edited last week? Do we need to show the picker and ask him to open file again? It will be nice to have a list of the recently used documents and provide a way to reopen them with one click. Fortunately, WinRT architects thought about this scenario and introduced several classes grouped together within Windows.Storage.AccessCache namespace.