has anyone got sound notifications to work using firefox with Windows Media Player? I'm trying, but seems to be impossible.

I've already installed the media player plugin from microsoft (as indicated in the firefox site: Download the Windows Media Player Firefox Plugin - Port 25: The Open Source Community at Microsoft), but firefox keeps saying that I need and additional plugin, and suggests me Apple Quicktime, which I don't usually have.

Is sound notifications supposed to work only with Quicktime in Windows/Firefox, or there is a solution?