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header("Content-Type: application/vnd.ms-excel; charset=utf-8"); header("Content-type: application/x-msexcel; charset=utf-8"); header("Content-Disposition: attachment; filename=abc.xsl"); header("Expires: 0"); header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); header("Cache-Control: private",false); echo "Some Text" Here is code to write and download xsl file using php, my problem is when i open excel file MS-Excel show warning before opening file says The file you are trying to open is in different format than specified by the file extension...Blah blah What's to do with PHP code to remove this warning? Contents are written correctly. I know this is because content written in file are txt file content and file extension is incorrect, that is, xls. Solution? Please don't suggest to use any library.
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