The following CCL is the minimum required to add the Windows calculator to the Ansys TurboGrid Launcher:

GROUP: Windows Apps
  Menu Name = Windows
END
APPLICATION: Calc
  Group = Windows Apps
  Command = <windir>\system32\calc.exe
  Toolbar Name = Calc
END

Although the parameter Toolbar Name is not strictly required, you would end up with a blank toolbar button if it were not set.