Notepad++ already exists, is more reliable, and already has a md support plugin
recent vuln asside (big caveat ill admit) idk why you would use notepad at all when N++ exists
If you dont need any of the ++ why would you use notepad++ over notepad?
I always liked Crimson/Emerald more myself.
I don't find Notepad++ to be a good replacement for (the old) notepad, personally. It's too feature-filled. The big win of notepad was that it was genuinely minimalist.