I just want to execute a simple EXE file at T-39 stage. So I added the following code in WINNT.SIF. [GuiUnattended] AdminPassword=* EncryptedAdminPassword=NO OEMSkipRegional=1 TimeZone=190 OemSkipWelcome=1 DetachedProgram="%systemdrive%\Run.exe" But the problem is that, the file "Run.exe" is not executing. Location of Run.exe is "<CDROM>\$OEM$\$1\Run.exe". This file(Run.exe) was created by compilng a simple .BAT (Batch) file. Code of "Run.bat" is -- ECHO WELCOME TO WINDOWS XP ECHO Thank You PAUSE EXIT I viewed the similar topic on this forum, but it did not help me. 1. http://www.msfn.org/board/winnt-sif-detach...pid-123354.html 2. http://www.msfn.org/board/lofiversion/inde...gen/t67428.html Can anyone help me to execute an application at T-39 stage? and What are the limitations of "DetachedPrograms" ? Thank you for your help in advance !!