Windows RT MostRecentlyUsedList and FutureAccessList and the AccessCache namespace
View on LearningLine: https://learninglineapp.com/a/1038
This screencast by Mark Taparaskas covers the APIs in the WinRT Windows.Storage.AccessCache namespace for maintaining two lists of files/folders: the MostRecentlyUsedList and the FutureAccessList.
Apps typically add files and folders to either of the lists at the point that the user grants access; for example, after using one of the file pickers.
The list contents are preserved across app executions. On a subsequent run, the app can use the lists to access the files/folders again without any need for user confirmation.