create a file called "cmdlines.txt" directly in the $OEM$ folder. (note: no spaces in filename). That cmdlines.txt file gets parsed as if it was a batch file, at T-13, automatically by windows setup. Have the paths written correctly. Here's my cmdlines.txt, for a sample: CODE [Commands] "regedit /S mytweaks.reg" (where the file "mytweaks.reg" is also placed in the same directory - $OEM$)