WSL uses them for one (so good luck backing up WSL installations) https://blogs.msdn.microsoft.com/wsl/2016/06/15/wsl-file-system-support/ https://blogs.msdn.mi

WSL uses them for one (so good luck backing up WSL installations) https://blogs.msdn.microsoft.com/wsl/2016/06/15/wsl-file-system-support/ https://blogs.msdn.microsoft.com/wsl/2016/06/15/wsl-file-sys... Other stuff does too, e.g. https://docs.microsoft.com/en-us/windows-hardware/drivers/ifs/kernel-extended-attributes https://docs.microsoft.com/en-us/windows-hardware/drivers/if... Those are user-level APIs as well, though usually called via NtQueryEaFile and NtSetEaFile. And (part of) my complaint is that DISM's /EA flag is broken.