The first version of WSL was launched back in August 2016, but the big boost came three years later with the release of WSL 2, which swapped an emulator for a Linux kernel.
According to Bleeping Computer, Microsoft also open-sourced the command line tools wsl.exe and wslg.exe this week, as well as the background service wslservice.exe, all components of WSL. 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.
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