Publisher Shared Storage Folder

Edit Manifest

<Package>
 <Extensions>
  <Extension Category="windows.publisherCacheFolder">
   <PublisherCacheFolder>
    <Folder Name="MyFolder">
   </PublisherCacheFolder>
  </Extensions>
</Package>

Access folder

Windows.Storage.ApplicationData.Current.GetPublisherCacheFolder("MyFolder");

Clear Folder

Windows.Storage.ApplicationData.Current.ClearPublisherCacheFolderAsync();