I just recently noticed that ImgBurn will burn an NRG image when the support is activated under Tools/Settings. After trying this feature out a few times I was very please with this functionality.
Eventually I came across a particular NRG file that ImgBurn complained about, however when I used another burning application I had no problem with it.
It turned out that my "problem" NRG file was an audio CD image. Has ImgBurn acted properly in this case, or have I missed a setting somewhere?
-C.