>My browser claims it needs to install a QuickTime plugin to play the notification sounds for this site. I don't have QuickTime installed, it's historically been a serious security hole (like Adobe Flash).
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>Can you tell me the file types used for the notification sounds so I can install an alternate player?

This is not required. This is usually being played by the Windows Media Player. I do not know why it would require that. We are sending a WAV file. So, something might have changed in your PC that Windows Media Player wouldn't be able to play it. Could it be?