Paste the Carbon.sav into the folder. Right-click the file > Properties > Check "Read-only". This prevents the game from auto-saving over your pristine 0% file. (Remember to uncheck this when you actually want to save your progress).
Never overwrite without a backup. Rename your old Carbon.sav to Carbon_old.sav. nfs carbon 0 save game
If you want to achieve a perfect 100% game, you need to know exactly where you started. A 0% save allows speedrunners and completionists to accurately track their progress without wondering, "Did I win that one race in Silverton three years ago?" Paste the Carbon