The other component that will remain closed source are the P9rdr.sys and p9np.dll files that make it possible to use “\wsl.localhost” for filesystem redirection from Windows to Linux.

It didn’t, however, make Lxcore.sys, P9rdr.sys, or p9np.dll open source, as they are part of Windows. If you want to download the source code for version 2.5.7, GitHub is the place to go.

Microsoft Windows Windows 11 Microsoft open sources the Windows Subsystem for Linux — invites developers to help more seamlessly integrate Linux with Windows News By Zac Bowden published 19 May 2025 ...

Microsoft has open-sourced the Windows Subsystem for Linux (WSL), making its source code available on GitHub, except for a few components that are part of Windows.

Microsoft closes 9-year-old feature request, open-sources Windows Subsystem for Linux WSL has also recently added official support for both Fedora and Arch distros.

Microsoft has officially open-sourced Windows Subsystem for Linux at its annual software engineer and web developer conference, Microsoft Build 2025.

Microsoft has introduced Fedora 42, another official distribution in the Windows Subsystem for Linux (WSL). However, this announcement was delayed. Fedora has already been listed in the officially ...

Microsoft is making its Windows Subsystem for Linux (WSL) open-source today, opening up the code for community members to contribute to. After launching WSL for Windows 10 nearly nine years ago ...