When i try to fetch files from a KnownFolder(Example: KnownFolders.MusicLibrary) which has hidden files i see a UnauthorizedAccessException.
Is it a possibility to get sense hidden files by any chance from the KnownFolders ?
Hidden files are not supported by the StorageFile
APIs. They should not be enumerated by the StorageFolder
APIs nor by the pickers. If you explicitly tried to open a file by name (because you already knew it existed) that is not a supported scenario (and in general you won't know what hidden files exist on other machines).