That warning may seem irrelevant to you since Internet Explorer was officially discontinued in 2015. Because the flaw that's been discovered can be exploited even if you never intentionally use Internet Explorer. If you were to launch Internet Explorer and save a web page, this is one of the file extensions that could be used. He says the exploit applies to Windows 7, Windows 10 and Windows Server 2012. To disable Internet Explorer on Windows 10, follow Microsoft's suggested steps:

Source: Forbes April 15, 2019 11:38 UTC