Export to Excel

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Hi guys, Currently the default button export to excel will generate excel with format .xls (1997-2003 version) instead .xlxs format. Does anyone know how to export the excel with .xlxs format?  I am try using the excel exporter, add is as new module, and it replace the old file in local disk, so it show over 100 errors because of this excel exporter module.  
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I want to know how to export EXCEL file too, if you have any solution can share with me ,it is best.

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