Winpeshl.ini controls whether a customized shell is loaded in Windows PE instead of the default Command Prompt window. To load a customized shell, create a file named Winpeshl.ini and place it in %SYSTEMROOT%\System32 of your customized Windows PE image. The .ini file must have the following section and entry.
AppPath = %SYSTEMDRIVE%\myshell.exe
%SYSTEMDRIVE%\mydir\application1.exe, -option1 -option2
application2.exe, -option1 -option2
AppPath entry to the path to your shell application. The path can be either fully qualified, or you can use environment variables, such as
AppPath entry does not support command-line options.
[LaunchApps] section to run applications with command-line options. The applications run in the order listed; separate the name of the application from its options with a comma.
When you exit the Command Prompt window or your customized shell application, Windows PE restarts.
Do not edit the value of CmdLine in the HKEY_LOCAL_MACHINE\SYSTEM\Setup registry key of Setupreg.hiv to start your shell application. The value of CmdLine calls Winpeshl.exe, which performs a number of functions, including calling the default Command Prompt window in Windows PE or your customized shell application.