View Single Post

(It generates an .xml (rather than .xlsx) file with a content which looks promising enough:

<?xml version="1.0" encoding="UTF-8"?>
<Workbook xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:html="" xmlns:o="urn:schemas-microsoft-com:office:office">
but the verdict given by Excel 2011 is that it is not a valid Excel spreadsheet, and manually changing the extension to .xlsx doesn't solve the problem)

You can, however, export from oo3 to .csv, and successfully import the .csv file into Excel 2011.