Convert ICO to Bitmap

procedure TForm1.Button1Click(Sender: TObject);
var
   Icon : TIcon;
   bmp : TBitmap;
begin
   Icon := TIcon.Create;
   bmp := TBitmap.Create;
   if OpenDialog1.Execute then begin
   try
      Icon.LoadFromFile(OpenDialog1.FileName) ;
      bmp.Width := Icon.Width;
      bmp.Height := Icon.Height;
      bmp.TransparentColor := clBlack;  // HIER TRANZPARENTE FARBE EINGEBEN
      bmp.Transparent := true;          // TRANZPARENT
      bmp.Canvas.Draw(0, 0, Icon ) ;
      bmp.SaveToFile(OpenDialog1.FileName + '.bmp') ;
    finally
    Icon.Free;
    bmp.Free;
   end;
   end;
end;