Search notes:

%SYSTEMROOT%\System32\lxss\tools

Among others, %SYSTEMROOT%\System32\lxss\tools seems to contain the Linux kernel (named kernel) for WSL Version 2.
The default location of a kernel can be overwritten with the kernel directive in %USERPROFILE%\.wslconfig.
Instructions on how this kernel can be installed or updated are found in https://aka.ms/wsl2kernel.

Other files

Other files besides the kernel that are found in this directory include:

Index