No need. If the save is corrupted, you wouldn't be able to open it; since you can, it's not a problem with the save.
If he can't open any saves, including his own SP saves, and every time he validates his files Steam reports two bad files, re-downloads those files and then still says two bad files when he revalidates, he needs to do a complete uninstall (including manually deleting any vestiges, including any stray ini files, left over cache files, etc.) and then reinstall the game.