Thanks Sonic! The problem is not inside txtsetup.sif where you can modify \i386 to \winxp1\i386 and it could work, tell me if I am wrong. The problem is neither inside the boot image that I extract with MagicIso, there is space to change the only one i386 to whatever ... The problem is inside setupldr.bin where we have just four chrs to change, I have tried multiple images with directories like: \W1\$OEM$ \W1\6 \W2\$OEM$ \W2\6 \W3\$OEM$ \W3\6 \W4\$OEM$ \W4\6 where 6 is the old i386 without any results ... does UltraIso do something different from MagicIso o WinIso?