You must have a copy of LRR to use this file.   This is the executable from the Masterpiece release (27/09/1999) of LEGO Rock Raiders. It is the only version compatible on modern operating systems due to the removal of SafeDisc from Microsoft Windows. If you intend to play the game, you will need this file.   Replace your EXE and ICD files in your LRR installation directory with these files.