If you see a Windows Security message saying These files can't be opened when opening an executable or other file, here's what you need to do!

Microsoft is testing new File Explorer AI-powered features that will enable Windows 11 users to work with images and documents without needing to open the files.

I have a folder full of .MHT files created by selecting "Save As "Web Archive, Single File". I have never had any trouble opening them on my PC, or any other PC running a current version of IE ...