On my Windows 10 machine I have installed WSL (debian distro). When I open a WSL terminal and type xclock a window pops up on my desktop showing the clock. I havent installed Xming or VcXSrv or any 3rd party X server. So I assume there must be some built in X server that comes with WSL.

Is my assumption correct? And if yes then can I use this “builtin” X server as a display server for remote GUI apps through Putty X11 forwarding? All the answers I have found on SO or the Web involve a 3rd party X server.