Can the converter program mount those images that it converts?
Yes. It would be weird that it cannot mount its own images...
Try a different conversion program.
I use nero but often find that that programs lack of support for iso to be quite frustrating. I use feeware to convert nrg to iso with no problem.
When I get home tonight, I will post the name of the converter program (can't remember the name) that I use.
BTW; Pulling content out of a bootable image to place in a new image does not make the new image bootable - the new image needs a boot loader.
Unfortunately, I currently have no other tool to manipulate the .nrg and .bin files.
But here is something new, and quite weird: the .nrg (and not the .bin) can be properly mounted with the control panel applet of ImDisk, but not with imdisk.exe, even if I manually set the offset found by the GUI (600). With imdisk.exe, the .nrg file is mounted, but Windows don't find a valid filesystem.
imdisk -a -m Z: -f D:\Image.nrg
imdisk -a -m Z: -f D:\Image.nrg -b 600)