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Code Block
//Specify either FileFormat.Xlsx or FileFormat.Xls to create a file
Workbook wb = ExcelApplication.Create(ExcelApplication.FileFormat.Xlsx);

ExcelApplication.Create() has been deprecated in favor of ExcelApplication.Create(FileFormat), but is still available for backwards compatibility.

The Create method uses an underlying template with defaults associated with the file format. XLS files use the defaults from Excel 2003; XLSX files use the defaults from Excel 2007. Switching to XLSX means the default template will change and the new defaults may change how output files look.