Jdev 11.1.1.7
<af:fileDownloadActionListener contentType="application/xls"
filename="report.xls"
method="#{.......}"/>
.xls format works, I was able to open the file. I couldn't get it work using .xlsx format. The file was downloaded in .xlsx format but cannot open it using Excel 2016. why?
<af:fileDownloadActionListener contentType="application/xls"
filename="report.xlsx"
method="#{.......}"/>