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();