The $OEM$ folders are used during the Windows installation process to customize and automate the setup. Here’s a quick reference for the most common folders within $OEM$: $OEM$\$$: Contains files that are copied directly into the Windows directory during installation. $OEM$\$1: Files in this folder are copied to the root of the system drive. $OEM$\$Progs: Used to copy files into the Program Files directory. $OEM$\$Docs: Files are copied into the user's Documents folder. The $2 folder is not a standard folder in the Windows installation process. The most common folders within $OEM$ are $OEM$\$$, $OEM$\$1, $OEM$\$Progs, and $OEM$\$Docs.
There is a thread dedicated to this kind of question: [REPO/HOW-TO/CHAT] Audit/Sysprep/Generalize; Setupcomplete/Firstlogon; Silent Install