Windows 10 has a new security flaw,
and it’s already being exploited in the wild. You could be infected with malware just from downloading a file, as File Explorer will automatically open the file and preview it. Windows 7 has the same problem.
The flaw affects all versions of Windows in active use: Windows 10, Windows 8.1, Windows 8, Windows 7, and various versions of Windows Server. (Of course, if you’re using Windows 7 and aren’t paying for extended security updates, you won’t get a security patch.)
Microsoft is working on a fix and expects it to be available on the next Patch Tuesday - that is, April 14, 2020.
Until then, an explanation of how to use a workaround that will protect your PCs from the security flaw is on the Arboleas Home Watch website in the Computer Advice and Alerts section.