Unfortunately it's proprietary, so I'd have to buy it to use it. I'm not willing to buy something I'll use infrequently.
It's also possible I'm barking up the wrong tree looking for ISOs. The game is a PlayStation game, so I'd be running it with PSX. What I need is the best format to use for burning it to disc so I can run it from the disc itself.
Yeah, ImgBurn is definitely your best bet... It's the only burning software I have installed on all of my systems! http://www.imgburn.com
When you say you're running it with PSX, do you mean on an actual PSX, or the emulator for Windows called PSX? If it's the emulator you're talking about, it's got built in image loading functionality, so you may not even have to burn it.
I'm using the emulator. I realize that it can read the files directly, but I'd much rather have it on disc. It makes cataloging my collection that much easier.