Notepad would render .md as plain text. Now it renders .md as rich text. The complaint is that people like notepad explicitly because it doesn't support rich text. I personally write pretty much everything in notepad for this very reason unless I am making a document I need to share with someone. The reasoning from MS for the update is because they added copilot to notepad, another feature that upset many people. Copilot returns answers as markdown, which is completely readable, but didn't itch the happy conclusion MS wanted. So now notepad supports enough rich text to not only read .md, but render it too