UWP Folders overview
Library Folders:
KnownFolders.AppCaptures
KnownFolders.CameraRoll
KnownFolders.DocumentsLibrary
KnownFolders.HomeGroup
KnownFolders.MediaServerDevices
KnownFolders.MusicLibrary
KnownFolders.Objects3D
KnownFolders.Playlists
KnownFolders.RecordedCalls
KnownFolders.RemovableDevices
KnownFolders.SavedPictures
KnownFolders.VideosLibrary
Local Data Folder:
ApplicationData.Current.LocalFolder
Installation Folder:
Windows.ApplicationModel.Package.Current.InstalledLocation