From http://www.xpcreate.com/directories.htm FILESCD: Files and directories here will be placed on the installation CD, without any further manipulation or evaluation. Special attention should be given to this folder, as this is the "interface" between your files, and the final CD. Examples include: FILESCD\I386\WINNT.SIF FILESCD\$OEM$\CMDLINES.TXT FILESCD\$OEM$\$1\DRIVERS\ Now go to http://unattended.msfn.org/unattended.xp/view/web/14/ to understand more about cmdlines.txt, or http://unattended.msfn.org/unattended.xp/ for a broader view.