You can often come across NRG disk images that are not supported by your disk-barring program.
Nrg2 is also a simple command-line application that you can use to modify your NRG image format.
It is very easy to use. Once installed, you will open a terminal window and type 'nrg2iso image.nrg image.iso'. Once you run the command, you will find the file 'image.iso' which is similar to the 'image.nrg' file, but in the ISO format.
If you need to take your NRG images and need a program in more suitable formats such as ISO, Nrg2 is one of your best options.