This code will allow you to select multiple files from the common dialog box.

Option Explicit
'This will hold the files you select
Dim mySelet As String

Private Sub Form_Click()
'You need to use Shift to select multiple file.
   On Local Error GoTo OpenError

   With CommonDialog1
      .CancelError = True
      .Flags = cdlOFNAllowMultiselect Or _
               cdlOFNExplorer Or _
               cdlOFNPathMustExist

      .MaxFileSize = 1024

      .ShowOpen

      mySelet = FileName

   End With

   Exit Sub

OpenError:
   MsgBox "Cancel pressed"
   Exit Sub