JFX, thank you a lot for the WinNTSetup. I have an interesting question. Situation: while preparing the custom Windows 8 wim-image I run the system to the audit-mode by assigning a letter O: (\DosDevices\O: ) to the system-drive (i had to use any letter accept default C: ). After syspreping all values of the registry key \DosDevices\ were erased. Now with the normal installation, the system gets the letter C: (as usual). But if you use the WinNTSetup with this wim-image, the program automatically writes registry key \DosDevices\O: even if an option "mount as" was not used. Why? Where WinNTSetup reads this letter (used in audit mode) and why it decides to write the value again? I suppose WinNTSetup does not have to write \DosDevices\ values until it's told to. Or this is like a feature? Thanks. vladislays, hi! it's so nice to meet you here.