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Comments by barryblessing (Top 1 by date)
barryblessing
7-Nov-13 20:56pm
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Sorry if this is too late an answer, but use ClosedXML to export to .XLSX format. Then use Excel 2003 (or higher) or OpenOffice Spreadsheet to save the .XLSX file to .XLS format. The ClosedXML library is very effective.
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