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When the program closes, excel is never able to recover anything and says the file is corrupted. Problem is, when I came back to excel 2013, whenever I try to save the workbook(on excel 2013) it immediatly stops responding. I was developing it on excel 2013, however my workstation had a problem and I had to work on it from a computer with excel 2010 for about a week. The workbook is about 2MB right now, so it's not incredibly big. I am developing an excel "application" that will be distributed to a few users, so it has a lot of macros/vba code on it.
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