I have created an Excel 2007 spreadsheet using DocumentFormat.OpenXml.Spreadsheet. This file is supposed to be used as an attachment to an email message. However, I get errors when opening it stating that this file cannot be opened by using Microsoft Excel. "Do you want to search... online..?" I want to save this file in Excel 2003 format so I won't get that message. What do I do? I don't want users having trouble reading the attached Excel doc.
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