You are using Nero burning program cd, when creating image files from cd / dvd then the resulting file will shape or extension.NRG. NRG file is created exclusively by software nero so if you want to burn NRG image file must be returned with nero programas well. It is sometimes difficult for us who do not use Neroburning room, because other programs such as Ashampoo,CDBurnerXP, BurnAware Free, and others would have troublereading the image file NRG.