There is (was) a great easy way to request Excel or so with DDE, simple and useful but DDE has been closed (disabled by default) by Microsoft because it had been for years the open door to viruses injection … Once said 2 options : 1/ either use classes within Windows 2/ either request Office365 web. Then comes my question = how can we do that from SWI Prolog ? … as i didn’t see anything explaining it in a simple way till now … PS: For those who still want to use DDE you can read Office Watch …