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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, WinISO, Power ISO, Alcohol 120%, or Daemon Tools can mount NRG files onto virtual drives for reading.
Contrary to popular belief, .nrg files are not ISO images with .nrg extension and a header attached. For technical details on the nrg format
Use WinISO as an example
1. download and run WinISO
2. open the .nrg file
3. if you want to burn it onto your discs, click "Burn" on the toolbar,
if you want to add, delete, extract, just right-click, all of the functions will be shown.
It's very easy. You can have a try by yourself.
Try WinISO, there is a tutorial of edit ISO file. You can convert it to ISO and edit it . http://www.winiso.com/support/tutorials/edit-iso.html