Microsoft has begun to convert its classic Windows apps such as Wordpad, XPS viewer, Fax and Scan, Microsoft Character Map and many more via their Project Centennial. But there is no Notepad yet.
Project Centennial allows developers to upload classic Win32 apps to the Windows Store for use by Windows 10 users on x86 processors.
These apps are just for Windows 10 on the PC. They don’t yet support Windows 10 Mobile due to their 32-bit architecture.
Microsoft may bring these apps with their upcoming Windows 10 Anniversary Update due later this summer.