There's a difference between the "Notepad app" and notepad.exe. The Notepad app has the AI and all the new stuff in it. But the old C : \windows\system32\notepad.exe still exists, and is unencumbered ...
The difference between the two is that generative fill is only available on Copilot+ PCs with Snapdragon X Elite chips in them, while generative erase will work on any Windows 11 PC. This is surely ...