[file format] 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 CD images. Other than Nero Burning ROM, a variety of software titles can use these image files. For example, PowerISO, Alcohol 120%, or Daemon Tools can mount NRG files onto virtual drives for reading... Found on http://en.wikipedia.org/wiki/NRG_(file_format)
A proprietary CD image file format used by Nero Burning ROM to create and burn CD images. Despite its proprietary nature, various programs can read it, including Alcohol 120%, Daemon Tools and Power ISO. Found on http://www.flv.com/glossary.html