Depending on what you are looking for, this could mean a few different things:
Could you please clarify which of these you are interested in? Return to Monkey Island (NSP)(Base Game).part1.rar
Are you having trouble extracting or joining the multi-part RAR files to install the game? Game Information: Content Creation: Depending on what you are looking for, this
I’m not quite sure what you mean by in the context of that specific file name. Return to Monkey Island (NSP)(Base Game).part1.rar