/// <summary>
        /// Invoked when this page is about to be displayed in a Frame.
        /// </summary>
        /// <param name="e">Event data that describes how this page was reached.  The Parameter
        /// property is typically used to configure the page.</param>

#if WINDOWS_PHONE_APP

        private void ShowFileOpen(CompressAlgorithm? Algorithm)
        {
            var picker = new FileOpenPicker();

            picker.FileTypeFilter.Add("*");

            picker.ContinuationData["Operation"] = "CompressFile";
            picker.ContinuationData["CompressAlgorithm"] = Algorithm.ToString(); 

            picker.PickSingleFileAndContinue();
        }