http://en.wikipedia.org/wiki/NRG_%28file_format%29
A .nrg file is a proprietary CD image file format used by Nero Burning ROM, a utility suite made by Nero AG, to create and burn ISO 9660 CD images.
Other than Nero Burning ROM, a variety of software titles can use these image files. For example, Power ISO, Alcohol 120%, or Daemon Tools can mount NRG files onto virtual drives for reading.
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