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Microsoft is killing WordPad in Windows after 28 years
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
Notepad is just a barebones text editor. I doubt there were any substantial changes since Windows 95, other than ensuring it runs on a 32 and later 64 bit infrastructure, and the menu works with newer releases. That sounds like a 1h per quarter job at most.