I never done it really, but after looking it up, I guess its easy.

1. You have to have be able to boot backups using swap magic or a modchip.
2. Open WinRAR
3. Browse to the folder the game is in
4. Highlight the 1st numbered file with a single click
5. Click 'Extract To..'
6. Choose an extraction location, or just click OK
7. Sit back, and wait for the iso to be extracted.
8. Burn ISO file using Nero / Alcohol 120% to a blank DVD of good quality

I hope this helps.

edit: actually, I'll have to take back my words, its not that easy. Most of the latest discussions on the ps2 forum @ afterdawn.com are about this game.