Visual Basic.NET - como revisar un documento doc xls ppt desde visual basic

''ABRIR ARCHIVOS

        Dim OpenFileDialog1 As New OpenFileDialog

        OpenFileDialog1.InitialDirectory = My.Computer.FileSystem.SpecialDirectories.ToString

        OpenFileDialog1.Multiselect = True

        If (OpenFileDialog1.ShowDialog(Me) = System.Windows.Forms.DialogResult.OK) Then

            Try

                Process.Start(OpenFileDialog1.FileName)

            Catch ex As Exception

                Console.WriteLine(ex.Message)

            End Try