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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.
There's a npp plugin called Big Files, I haven't used it but it might be worth a look.
ref. https://github.com/superolmo/BigFiles
also
https://github.com/molsonkiko/HugeFiles
also interesting on this topic
https://www.howtogeek.com/869782/notepad-can-handle-your-huge-text-files-again/
Can't use plugins unfortunately..