A new AI-powered Cowriter feature has been discovered for the Notepad app. It's currently in the testing phase as Microsoft has just added the placeholder in the latest Windows 11 Insider build. The upcoming Cowriter feature will let you rewrite content, make paragraphs shorter or longer, change the tone of the text, and change the format. There is also an "Explain with Copilot" menu in the context menu of the Notepad app. The feature will have a waiting list and a credit system for using the AI tool.