I would like to add a custom windows startup sound to my theme, but not by modifying imageres.dll, but instead, simply adding it to the theme file

I've found this format on google but it seems it was for windows XP, anybody knows how to do this in 7 ?

[AppEvents\Schemes\Apps\.Default\SystemStart\.Current]
DefaultValue=%ResourceDir%\Themes\xxx\Extras\Sounds\Custom Windows Startup Sound.wav