Folder picker and Path

Question

Hello

I got a folder from my folderpicker, and saved to de FutureAccessList

Dim Elegir As FolderPicker = New FolderPicker()
Elegir.FileTypeFilter.Add(".xml")
Dim CarpetaElegida As StorageFolder = Await Elegir.PickSingleFolderAsync()
StorageApplicationPermissions.FutureAccessList.AddOrReplace("Carpeton", CarpetaElegida)

But when I try to used later on like this:

Dim CarpetaOrigen As StorageFolder = Await StorageApplicationPermissions.FutureAccessList.GetFolderAsync("Carpeton")
Dim doc As XElement = XElement.Load(CarpetaOrigen.Path & "\Configuracion.xml")

I get an error : "Access to the path 'C:\Users\Diego\Documents\Configuracion.xml' is denied."

In that folder there are like a hundred .XML files that I need to Read & Write.