Need help using Dummy Files...

I'm trying to backup Tokyo Extreme Racer. I UnRARed the files and the result was a .iso file that is 649mb in size. I only have 700mb cds and I want to dummy the iso so that it runs smoothly. Can anyone direct me in how I would go about doing this? Any help would be greatly appreciated. Also does anyone know how I would burn this project with Nero once I have the dummy file and the iso ready to go. Thanks in advance...