WinRT: QStandardPaths::writableLocation() returns empty strings for some enumeration values

Standard paths [*...* denote writable entry]:
  DesktopLocation: "Desktop"
  DocumentsLocation: "Documents"
  FontsLocation: "Fonts"
  ApplicationsLocation: "Applications"
  MusicLocation: "Music"
  MoviesLocation: "Movies"
  PicturesLocation: "Pictures"
  TempLocation: "Temporary Directory" *C:\Users\Hans Mustermann\AppData\Local\Packages\75f453fc-a91a-4d14-8d82-266ed9370613_as4453j78kztc\TempState*
  HomeLocation: "Home"
  AppLocalDataLocation: "Application Data" *C:\Users\Hans Mustermann\AppData\Local\Packages\75f453fc-a91a-4d14-8d82-266ed9370613_as4453j78kztc\LocalState*
  CacheLocation: "Cache" *C:\Users\Hans Mustermann\AppData\Local\Packages\75f453fc-a91a-4d14-8d82-266ed9370613_as4453j78kztc\LocalState\cache*
  GenericDataLocation: "Shared Data" *C:\Users\Hans Mustermann\AppData\Local\Packages\75f453fc-a91a-4d14-8d82-266ed9370613_as4453j78kztc\LocalState*
  RuntimeLocation: "Runtime"
  ConfigLocation: "Configuration" *C:\Users\Hans Mustermann\AppData\Local\Packages\75f453fc-a91a-4d14-8d82-266ed9370613_as4453j78kztc\LocalState*
  DownloadLocation: "Download"
  GenericCacheLocation: "Shared Cache" *C:\Users\Hans Mustermann\AppData\Local\Packages\75f453fc-a91a-4d14-8d82-266ed9370613_as4453j78kztc\LocalState\cache*
  GenericConfigLocation: "Shared Configuration" *C:\Users\Hans Mustermann\AppData\Local\Packages\75f453fc-a91a-4d14-8d82-266ed9370613_as4453j78kztc\LocalState*
  AppDataLocation: "Application Data" *C:\Users\Hans Mustermann\AppData\Local\Packages\75f453fc-a91a-4d14-8d82-266ed9370613_as4453j78kztc\LocalState*
  AppConfigLocation: "Application Configuration" *C:\Users\Hans Mustermann\AppData\Local\Packages\75f453fc-a91a-4d14-8d82-266ed9370613_as4453j78kztc\LocalState*

qt.winrtrunner.app: io\qstandardpaths_winrt.cpp:118: class QString __cdecl QStandardPaths::writableLocation(enum QStandardPaths::StandardLocation): Unimplemented code.
qt.winrtrunner.app: io\qstandardpaths_winrt.cpp:118: class QString __cdecl QStandardPaths::writableLocation(enum QStandardPaths::StandardLocation): Unimplemented code.
qt.winrtrunner.app: io\qstandardpaths_winrt.cpp:118: class QString __cdecl QStandardPaths::writableLocation(enum QStandardPaths::StandardLocation): Unimplemented code.
qt.winrtrunner.app: io\qstandardpaths_winrt.cpp:118: class QString __cdecl QStandardPaths::writableLocation(enum QStandardPaths::StandardLocation): Unimplemented code.
qt.winrtrunner.app: io\qstandardpaths_winrt.cpp:118: class QString __cdecl QStandardPaths::writableLocation(enum QStandardPaths::StandardLocation): Unimplemented code.
qt.winrtrunner.app: io\qstandardpaths_winrt.cpp:118: class QString __cdecl QStandardPaths::writableLocation(enum QStandardPaths::StandardLocation): Unimplemented code.
qt.winrtrunner.app: io\qstandardpaths_winrt.cpp:118: class QString __cdecl QStandardPaths::writableLocation(enum QStandardPaths::StandardLocation): Unimplemented code.
qt.winrtrunner.app: io\qstandardpaths_winrt.cpp:118: class QString __cdecl QStandardPaths::writableLocation(enum QStandardPaths::StandardLocation): Unimplemented code.
qt.winrtrunner.app: io\qstandardpaths_winrt.cpp:118: class QString __cdecl QStandardPaths::writableLocation(enum QStandardPaths::StandardLocation): Unimplemented code.