With this update, we are introducing support for multiple tabs—a top requested feature from the community—where you will be able to create, manage, and organize multiple files in a single Notepad window! You can also continue to work with files across multiple windows by dragging a tab out into its own window, and a new app setting lets you customize whether files open in new tabs or a new window...
Tabs in Notepad begins rolling out to Windows Insiders
Found 12 days ago at Microsoft Windows Team Blog
