procedure TForm1.SaveFirstFrame1Click(Sender: TObject);
var
  iIEBitmap: TIEBitmap;
begin
  if SavePictureDialog1.Execute then
  begin
    iIEBitmap := TIEBitmap.Create;
    try
      iIEBitmap.Assign(ImageEnMView1.GetTIEBitmap(0));
      iIEBitmap.Write(SavePictureDialog1.FileName);
      ImageEnMView1.ReleaseBitmap(0);
    finally
      iIEBitmap.Free;
    end;
  end;
end;

ImageEnMView1.GetImageToFile(0, SavePictureDialog1.FileName);