WinCopies is a free and open-source file system explorer software. It is currently still in development, so you can test it and report any bug you find at the WinCopies' GitHub repository.

Alternative download link

WinCopies uses the .Net Core and WinCopies frameworks. Before launching WinCopies, make sure you have the .Net Core framework installed on your computer (at least version 3.0).