Okay...
IF they are zipped(meaning if you download it from a website like here...they probably are)...you have to unzip the folder.
You can use this....
www.winzip.com .....the trial version will work for 45 days.
Once the folder is unzipped and the save is on the USB drive...make sure the structure is this...
PS3/SAVEDATA/BCUS(49303859...I'm making these numbers up...they are different for each save) inside here are the actual save files.
With the USB in the PS3....go to the front screen(the screen you see WITHOUT a game in...)
Go to the GAME section
Go to the SAVED DATA UTILITY(PS3) section
Highlight the USB drive...hit X..
Highlight the save...hit triangle...and choose COPY.
This will copy the save to your hard drive.
Now when you play the game...you have to choose that saved roster when you are ready to play or start a franchise.
Let me know if you need anymore help.
M.K.
Knight165