Windows 7 Problem with putting Sounds into themes

Although I'm a C# .Net Software developer I can't figure you how to make the sounds work when creating a theme. I assign my startup .wav file to the "open window" event in order to hear it without having to shutdown and startup windows. When I get things like I like them I assign "none" to the open window event because I don't want that to play there in the finished theme. But as soon as I save the theme as a themepak the sound comes back again.

Is there some secret here or is this whole theme area full of bugs? How can I permanently remove the sound?

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