Files is a file manager which leverages the latest features of the Windows platform including Fluent Design, seamless updates, and APIs which enable the performance and lifecycle behavior that users expect.
File Explorer (Windows 10), previously known as Windows Explorer, is a file manager application that is included with releases of the Microsoft Windows operating system from Windows 95 onwards. It is sometimes referred to as the Windows shell, explorer.
The Finder is the first thing that you see when your Mac finishes starting up. It opens automatically and stays open as you use other apps. It includes the Finder menu bar at the top of the screen and the desktop below that.