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There have been experiments along these lines for some time now. E.g. there's https://learn.microsoft.com/en-us/windows/security/applicati...

And before that, some people might remember https://en.wikipedia.org/wiki/Virtual_PC#Windows_XP_Mode.

This! I won't buy a Windows OS to run stuff because rebooting is annoying and I end up rarely ever actually dual booting. But I'd pay good money for a Windows Classic library on Linux.

Imagine if they could sell a copy of Windows for each legacy app or game you want to run, instead of the one copy running the hardware...

Windows Subsystem for Windows?

How about, “Winception”

Already exists, read up about "Windows on Windows" and "WOW64" :)

It’s basically what Apple did when moving from OS 9 to OS X. Old applications would load up in Classic, allowing users to start using the new system, while developers had time to update their apps.