I am in agreement with Trip, in that do not touch any of the files with in your Bridgeport.sims 3 folder. It could severely damage the save.
However, if you have any Bridgeport.sims3.backup or Bridgeport.sims3.bad. It's safe to delete those.
I have a habit of using Save As, type in a name. Such as SV-LW02. I do this for every play session. After I am done playing and have exited the game I move the save file to a folder outside of the Electronic Arts/Sims 3 folder.
A note on Kuree's Save Cleaner tool, like Trip mentioned use at your own risk. Back your saves up first. As the program (Save Cleaner V2.2) has been known to make save files crash and become un-usable.