Merge Multiple Files in Vb 2005

[BarryM]

hey does anybody know how to merge any kind of two or several files and split them up. I know how to merge multiple image files but dont know to do it with any other type

Dim sw As New IO.FileStream(NewFilePath, IO.FileMode.Create)
                Dim fmt As New System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
                Dim bmp As Bitmap

   Filelist.Items.Add(ImageName)
                For Each item As String In Filelist.Items
                  bmp = CType(Bitmap.FromFile(ImageName), Bitmap)
                    fmt.Serialize(sw, bmp)
                Next
                sw.Close()

any help would be good