If you have Xploder, you can use a save game file from any OTHER game to resign the save.
Iit does not need to be a SF4 game save to resign it. Check the link that VReal posted.
Originally posted by ChrisBalrog
CFW?
I wanted to resign the original Street Fighter 4 to get the Platinum but then I realized I can't get my save file out of my PS3 OFW and since I need it on my computer to remove the copy-protection, there nothing I can do to it.