Windows 10 Build 21364 gains support for Linux GUI applications on Windows Subsystem for Linux (WSL) It’s Wednesday, so that means it’s time for a new Windows 10 Insider build on the Dev Channel, and Build 21364 is one of the best releases in a while with exciting new features for Windows Subsystem for Linux (WSL) and Task Manager. Arguably the biggest addition here is that Windows Subsystem for Linux now includes a first preview of support for GUI applications. Nicknamed WLSg, this open source feature lets you run your favorite Linux GUI apps, which makes it even more useful. Microsoft explains: