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There’s AI Inside Windows Paint and Notepad Now
(www.wired.com)
This is a most excellent place for technology news and articles.
You can either uninstall new version of Notepad or return to the old one using some registry trick (look it up).
Or you can download some version of Microsoft Notepad on the internet (probably not really that safe) or even ReactOS Notepad if you really insist of having such simple program, but using I'd recommend to use something like Notepad++ instead.