NRG is an image file created by Nero. You can use “Magic ISO Maker” software to extract file from nrg image.
Download it from here http://www.magiciso.com/download.htm
Introduction from maker site:
|Simple and Intelligent|
|MagicISO is a powerful CD/DVD image file creating/editing/extracting tool. It can open / create / edit /extract CD/DVD image files, and it canconvert bin to iso and back. as well as make ISO file from DVD/CD-ROM or hard disk, and handle bootable information at meanwhile.
|Support all known CD image type|
|It can also convert BIN or any other format file created by CD burning software (Such as Nero-Burning ROM, Easy CD Create) or virtual DVD/CD-ROM driver software (such as Daemon-tools) to standard ISO format.|
|Directly edit CD/DVD image file(s)|
|MagicISO has ability to create ISO image file. You can directly add/delete/rename files or folder in CD image file(s) with MagicISO.MagicISO can handle up to 10G large sizes so that user can extract / edit / open DVD image files in ease.|
|Backup CD/DVD to your hard disk.|
|You can use MagicISO to make CD/DVD image from DVD/CD-ROM to hard disk in order to backup CD/DVD or use it with virtual CD or Virtual machine.
|Make Bootable CD/DVD|
|MagicISO has ability to make bootable CD/DVD image file. With MagicISO, you can process the boot information for CD/DVD image file, as well as directly add/remove/extract boot image for the CD/DVD image file.
MagicISO can also make multiple bootable CD/DVD image file. Using this function, you can combine multiple OS installation CD into one CD/DVD image file in order to install multiple OS from one CD/DVD.
|Windows Explorer Embed.|
|MagicISO embed Windows Explorer and use the double window unification user contact interface. Use the quick button and the mouse Drag & Drops files between Windows Explorer and MagicISO so that you can handle the CD/DVD image file easy but powerful enough.|