Illustrator CS6 can't open the Illustration

I'm trying to open an AI file that opened last week but won't open anymore. It was saved as an AI file with CS6 compatibility. It will open in Adobe reader but I can't just resave it and open the new file in Illustrator because it has some Map Layers which use the MAPublisher plugin. Any idea on how to repair or open this file in AI? I've taken the steps in this link: How to recover a corrupted AI file, but there is no detailed error message so I don't know which part of the AIPrefs file to look at which has over 1000 lines of code.

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