This application allows you to open, view Modern Warfare 3 Game Saves DVARS And Values, this can be used for USB modding without any JB/CFW PS3.

Do not remove any files in the application's folder because then its not going to work correctly.

How To Use Tool:
Copy Modern Warfare 3 Game Save from PS3 to PC
Start Up Application and Open The Game Save Folder
Edit Game Saves however you like
Save All to save every changes to have made to the save files
Copy back to PS3 and you should be good to go.