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I actually once saw the Win 7 UI appear behind the Win 11 UI in Acrobat Reader. Not sure if this was some Acrobat specific stuff or if it’s still “there” in ge

• jeroenhd 3y ago
  For compatibility mode, there's a bunch of old theming stuff. If you manage to crash a program in the right way, you can even get a Win2k-style grey-and-blue window to appear in some places, though it's hidden well. This is the company that put the entire Windows 95 memory manager into later versions of Windows to keep compatibility, there are tons of old code paths still lying in wait for old software to reuse. You can't use this stuff as your main UI well, it's no longer tested or optimised for that use case.