Haha unity is an enigma, my friend! It's alright I noticed it was in the registry. I thought it was in LocalLow but it didn't actually store the save there.
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Well, when I deleted the folder in local low, it seemed to reset the game. So that's how I found it. About the space thing, when your trying to clear up space, getting rid of big things is easy, but when you have a mass of tiny files that have accumulated over the years it can be a real headach. You don't want to accidentally deleat something important.