If it's anything like the Linux files inside File Explorer supported they added previously (https://devblogs.microsoft.com/commandline/whats-new-for-wsl-in-wind

If it's anything like the Linux files inside File Explorer supported they added previously (https://devblogs.microsoft.com/commandline/whats-new-for-wsl-in-windows-10-version-1903/ https://devblogs.microsoft.com/commandline/whats-new-for-wsl...), it'll be using some derivative of Plan 9.