Format

Hi

today I am generate xlsx over the example format but Excel from Office 365 family this file (downloaded 2 weeks before) do not open (Errof: file is damaged or have bad extension). But after change file to zip and open the file, its look good (there are three sheets).

And I am test separattely, if format is 'columnname' => '0' in the header, during the open file, Excel indicates that it has made a correction data in sheet.

Jaroslav Zeman