Filamin

I have downloaded the Save files from an official server. I would now like to be able to play that world as a single player game. However, when I put the files into the save directory, I get a message about "Invalid or corrupted savegame". When I try to start that world, the game starts into repair mode. However, it never completes. Should I be able to play a server save game as a single player world? What steps need to happen to accomplish this? Thanks