App Files
App files are regular files on the local file system, but in a private location specific to your app. Therefore, as with app settings, you can interact with app files without needing any capabilities. You can create any number of files and subfolders without worrying about quotas (except for roaming files), although there is still the limitation of supporting subfolders up to only 32 levels deep.
This section examines the three types of app files: local files, roaming files, and temporary files. It also includes files packaged with your app (“packaged files” or “resources”) for completeness. Although such files are not part of the app data mechanism, shipping read-only data files with your app can be a great option to keep in mind. ...
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