After looking closer at the main notepad++ site, I found this wiki. Looks pretty in-depth. http://sourceforge.net/apps/mediawiki/notepad-plus/index.php?title=Plugin_Development (link not working)
Here is a copy of the page from the internet archive... http://web.archive.org/web/20140328055927/http://sourceforge.net/apps/mediawiki/notepad-plus/index.php?title=Plugin_Development
Correct link : https://npp-user-manual.org/docs/plugins/
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