Hi Silvio,
We deeply regret for the delay.
You can change the excel version when export to excel by manually. Please refer to the following code which explains the same.
GridExcelConverterControl gecc = new GridExcelConverterControl();
ExcelEngine engine = new ExcelEngine();
IApplication app = engine.Excel.Application;
app.DefaultVersion = ExcelVersion.Excel2007;
IWorkbook book = app.Workbooks.Create();
gecc.GridToExcel(MyGrid.Model, book.Worksheets[0], ConverterOptions.ColumnHeaders | ConverterOptions.RowHeaders);
Let me know if you have any further concerns.
Regards,
Ragamathullah B.