This extension is deprecated. WSL now natively supports graphical applications. For SSH, please use the X11 support built into the official remote SSH extension. See this issue for discussions on setting it up.
Remote X11 is a Visual Studio Code extension that sets the DISPLAY environment
variable when working in a remote environment so that X windows applications
started from Visual Studio Code appear on the local machine.
The extension folder contains the main extension. See its README
for more details.
The ssh folder contains a helper extension that lets the main extension work
when connected to a remote machine via SSH.