Sub ExportControlPoints()

  'Pick a curve object
  Dim strObject
  strObject = Rhino.GetObject("Select curve", 4)
  If IsNull(strObject) Then Exit Sub

  ' Get the curve's control points
  Dim arrPoints
  arrPoints = Rhino.CurvePoints(strObject)
  If Not IsArray(arrPoints) Then Exit Sub

  ' Prompt the user to specify a file name    
  Dim strFilter, strFileName
  strFilter = "Text File (*.txt)|*.txt|All Files (*.*)|*.*|"
  strFileName = Rhino.SaveFileName("Save Control Points As", strFilter)
  If IsNull(strFileName) Then Exit Sub

  ' Get the file system object
  Dim objFSO, objStream
  Set objFSO = CreateObject("Scripting.FileSystemObject")

  ' Open a text file to write to
  On Error Resume Next
  Set objStream = objFSO.CreateTextFile(strFileName, True)
  If Err Then
    MsgBox Err.Description
    Exit Sub
  End If

  ' Write each point as text to the file
  Dim strPoint, strText
  For Each strPoint In arrPoints
    strText = Rhino.Pt2Str(strPoint)
    objStream.WriteLine(strText)
  Next

  ' Close the file
  objStream.Close

End Sub