What code language is terraria save's in?

Super off topic and random post I know, however I'm trying to seek a possible way to repair files and maybe create a program to piece parts around. I can't for the life of me figure out what language the actual player saves are saved as. I do know for a fact terraria is made in C# in the XNA Game Studio but that does not along side for the saves? Do the actual player saves co side with the xna engine?
 
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