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Download Excel Message

Richard Korts
on
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Last Modified: 2016-02-08
See attached message.

I get this every time I download an Excel spreadsheet generated in php with the following header:

header("Content-type: application/vnd.ms-excel");
$fn = "registrants" . date('Y-m-d_h_i') . ".xls";
header("Content-Disposition: attachment; filename=" . $fn);

If I change the file extension to xlsx will that solve this?

Thanks
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