This icon is also used in Windows XP if Display Color quality is set to 16 colors or 256 colors.
It is seen in Windows Longhorn.
Notepad will be available on the Microsoft Store and will not be included on Windows 10 Version 2004.
Microsoft Windows apps
3D Builder | Alarms | Battery Saver | Calculator | Calendar | Camera | Clock | Console | Data Sense | File Explorer | Fresh Paint | Games | Groove Music | Mail | Maps | Messages | Movies and TV | Music | Notepad | Paint (3D) | People | Phone | Photos | Podcasts | Settings | Storage Sense | Video | Wallet | WordPad