How can I add a Windows startup sound to Hiren's BootCD PE?

To add the Windows startup sound to Hiren's BootCD PE, you can modify the ExtPrograms section of the HBCD_PE.ini file found at the root of the USB flash drive as shown below:

_SUB ExtPrograms
    EXEC @!%WinDir%\System32\mpg123.exe -q %SystemRoot%\Media\startup.mp3
_END