Gustavo Alves - 2016-10-07 17:12:25 - In reply to message 4 from synthetron
You can bypass this message. My class creates a .mhtml file with a .xls extension, so it will be forced to open on Microsoft Excel. This class is purposed to be a simple gateway between HTML and XLS, without parsing and other complicated stuff.
Feel free to ask if you have any doubts.