取得PROGRAM FILES目錄位置

procedure TForm1.Button1Click(Sender: TObject);
begin
  With TRegistry.Create do
  try
    RootKey := HKEY_LOCAL_MACHINE;
    if OpenKey('Software\Microsoft\Windows\CurrentVersion', False) then
      Caption := ReadString('ProgramFilesDir');
  finally
    Free;
  end;
end;