http://psx-scene.com/forums/f150/opl-0-9-user-guide-errata-104937/잘 읽어보면 답이 있는 것 같군요.
Enable Delete and Rename operations: Off (default) Allows you to display (On) the options on screen from the Hint menu on each list or disable it (Off) to prevent accidental renaming or deletion or accidental launching of the HDL Server when trying to save changes to OPL's configuration. When Rename/Delete is disabled, the "HDL Server" option will disappear from the main settings menu, and the VMC options to change the VMC size or delete will be disabled.