Exporting GridView to PowerPoint 2007 issues

Question

Hi all, I'm facing a stange issue. When I export a GridView as a power point attachment it shows fine using PowerPoint 2003 but does not show at all using PowerPoint 2007, is there any special tag or style I should use to show it correctly on PowerPoint 2007?

UPDATE: It does not even show a simple HTML saying Hello World :(

Thanks.

This is the code

protected void Page_Load(object sender, EventArgs e)
 {
  Response.Clear();
  Response.Buffer = false;
  Response.BufferOutput = false;
  Response.Charset = "";
  Response.ContentType = "application/vnd.ms-powerpoint";
  Response.AddHeader("Content-Disposition", "attachment;filename=\"ChartData.ppt\"");

  BindData();
 }

 private class Data
 {
  public Data(string name, string description)
  {
   Name = name;
   Description = description;
  }

  private string _name = string.Empty;

  public string Name
  {
   get { return _name; }
   set { _name = value; }
  }

  private string _description = string.Empty;

  public string Description
  {
   get { return _description; }
   set { _description = value; }
  }



 }

 private void BindData()
 {
  System.Collections.Generic.List<Data> data = new System.Collections.Generic.List<Data>();

  for (int index = 0; index < 10; index++)
  {
   data.Add(new Data("Name_" + index, "Description_" + index));
  }
  _toExport.DataSource = data;
  _toExport.DataBind();
 }