This is a common question we hear from customers. The answer: calculation ambiguity with linked cells. If you had a cell ='[Book1.xlsx]Sheet1'!$G$33 and you had two books named “Book1” open, there’s no way to tell which one you mean.
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Read the complete post at http://blogs.msdn.com/excel/archive/2009/01/07/why-can-t-i-open-two-files-with-the-same-name.aspx
Posted
Jan 08 2009, 12:05 AM
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Microsoft Excel