Kenneth at CuteSoft emailed me the answer directly so I am posting it here.
Response.Write("persisted." + args.FileGuid + ".resx");
and in vb.Net
Dim sHoldthis As String = "persisted." + args.FileGuid.ToString + ".resx"
If you look at the property directly in the Property Viewer,
args.FileGuid =Nothing
so for whatever reason, it has to be directly in the code to
retrieve the value.
Thanks Kenneth