windows vista -> nsis using game explorer

[DOCa Cola]

still no success with

code:
${If} ${AtLeastWinVista}

  SetOutPath $PLUGINSDIR

  File GameuxInstallHelper.dll # from dxsdk

  System::Call "GameuxInstallHelper::RetrieveGUIDForApplication(t '${GDF}', g .r0)"

  System::Call "GameuxInstallHelper::RemoveFromGameExplorer(*g r0)"

  System::Call "GameuxInstallHelper::RemoveTasks(*g r0)"

  System::Call "GameuxInstallHelper::RemoveRichSaveGames(t '.ExampleSaveGame')"

  SetOutPath $INSTDIR

${EndIf}

the uninstaller seems to run fine but the game doesn't seem to be removed from the game browser...