This is the SpaceFM Desktop, based around the Linux file system. Its core component is SpaceFM, a powerful graphical file manager.

Well, manage files of course! But it has many other capabilities that are covered below and in documents listed under Links.

Its great benefit is to allow you to use icons for any item in the file system with a simple drag-and-drop.

Everything you want/need to know about SpaceFm is in its manual see link below.