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This allows any ISO (nightly, etc.) to perform unattended installations without having to manually rebuild the ISO with your modified unattend.inf file. Instead, you simply need to place your custom unattend.inf file at the root of any drive in the machine (and with a special value set in this .inf to enable this feature). Notes: - It tries to use `QueryDosDeviceW` if kernel32.dll is loaded (GUI setup), so that the drive map matches the existing user logon session. If not available, it emulates a simplified version of `QueryDosDeviceW` which should be enough when booted directly into phase-1 setup. - The unattend.inf file lookup algorithm goes as follows: Find first the default unattend.inf file on the installation media. If it specifies an unattended setup, we have found it. Otherwise, the default unattend.inf file does not exist, or does not enable an unattended setup. Check all DOS drives, removable first, then fixed, for an alternative unattend.inf that enables unattended setup. If we find one, use it; otherwise, return the default unattend.inf path. Co-authored-by: Hermès Bélusca-Maïto <hermes.belusca-maito@reactos.org>