I read some threads, but couldn't find a direct answer.
I know my Nero version is probably old (version 5) but it works. In fact I burned an ISO image just a few days ago.
Today when I try, using the wizard or not, I get to the selection of where the ISO image resides. I click on the file to open. Then when I select open it insists on saving this as a nero image first (.nrg file). I never did this before nor the other day when I performed a similar function.