//--- Open an Excel BIFF8 (.xls) file
FileStream oFileStream = New FileStream(@"C:\Templates\Template.xls", FileMode.Open);
oExcelTemplate.Open(oFileStream);
//--- Open an Office Open XML Excel (.xlsx) file
FileStream oFileStream = New FileStream(@"C:\Templates\Template.xlsxlsx", FileMode.Open);
oExcelTemplate.Open(oFileStream);
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