I use Thunderbird 1.0.2 for my e-mails, and back when I used to use it under Win XP, I had this nice litte .wav that played when I had received a new message. Now, under Mac OS X 10.4.1 (on a mini) I have transferred this .wav to my Documents folder and set the path in Thunderbird (see pic), but the sound never plays. It doesn't play when I press "Preview" either. It does play a sound however when I select "System New Mail Sound". Does anyone have an idea here? How could I get my custom .wav to play when I receive a new mail? Thanks!!