I go to new game and it asks me to insert disc, I have 2 types of files that came with the download inside the rar, MDF, and MDS. I run the MDF to get to 'New Game'. But when it asks me to Insert Disc 1 at the beginning, I don't know what to do. I tried file>change disc>Iso>Xenogears.mdf but "Wrong Disk"....Help me please!!