Microsoft has released the source code for the original Windows File Manager that debuted nearly 28 years ago in Windows 3.0. The source code has been modified a bit to make it compatible with modern Windows versions and can be downloaded via GitHub and compiled using Visual Studio 2015 and above.
https://www.notebookcheck.net/The-original-Windows-File-Manager-is-now-available-on-Windows-10-for-nostalgia-s-sake.296704.0.html