Need to use Physical Path on RadFileExplorer

I am using a solution with "radFileExplorer" used in the controls.
Here I was passing a virtual path that works just fine.

But when I added a network path to a Mapped Drive and used it in the "radFileExplorer ", it throws a run-time exception.
Any ideas guys on how to use the physical path correctly here?
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        protected void Page_Load(object sender, EventArgs e)
        {
            radFileExplorer1.Enabled = false;
            try
            {
                   //radFileExplorer1.InitialPath = Page.ResolveUrl("~/FoldersAndFiles");
                    radFileExplorer1.DisplayUpFolderItem = true;
                    radFileExplorer1.EnableOpenFile = true;
                    radFileExplorer1.AllowPaging = true;
                    radFileExplorer1.EnableCreateNewFolder = true;
                   
                    if (IsSuperUser() == true)
                    {
                        radFileExplorer1.EnableCreateNewFolder = true;
                    }
                    else
                    {
                        radFileExplorer1.EnableCreateNewFolder = false;
                        RemoveControlsFromFileExplorer("Delete");
                        RemoveControlsFromFileExplorer("Rename");
                    }
                    radFileExplorer1.VisibleControls = GetVisibleControls();  //Get the visible controls for the FileExplorer
                    radFileExplorer1.ExplorerMode = Telerik.Web.UI.FileExplorer.FileExplorerMode.Thumbnails;
                    radFileExplorer1.ExplorerMode = Telerik.Web.UI.FileExplorer.FileExplorerMode.Default;
                    radFileExplorer1.Configuration.AllowMultipleSelection = true;
                    radFileExplorer1.Configuration.MaxUploadFileSize = 1 * Constants.GigaByte;

                    InitializePageBasedControls();
                    radFileExplorer1.Enabled = true;
            }
            catch (Exception ex)
            {
                ShowException("Error:" + ex.Message);
                radFileExplorer1.Enabled = false;
            }
        }


        //Initialize the File Locations (Download/View/Delete) for the Current page
        private void InitializePageBasedControls()
        {
            string[] uploadPaths = new string[] {};
            string[] viewPaths = new string[] {};
            string[] deletePaths = new string[] {};

            //Set the paths as needed (Not working - Physical Paths)
            uploadPaths = new string[] { "R:\DataFolder\Upload" };
            viewPaths = new string[] { "R:\DataFolder\View" };
            deletePaths = new string[] { "R:\DataFolder\Delete" };

            //Set the paths as needed (Working - Relative Paths)
            //uploadPaths = new string[] { "~\FoldersAndFiles\Upload" };
            //viewPaths = new string[] { "~\FoldersAndFiles\View" };
            //deletePaths = new string[] { "~\FoldersAndFiles\Delete" };

            radFileExplorer1.Configuration.UploadPaths = uploadPaths;
            radFileExplorer1.Configuration.ViewPaths = viewPaths;
            radFileExplorer1.Configuration.DeletePaths = deletePaths;
      }
Error1.png