Works for me on Windows 7.

Is your experience any different if you hold shift while starting Thunderbird?

Matt- thanks for your help.

Unfortunately starting T-Bird in Safe mode makes no difference. I can neither browse for nor type a path (can't type anything, really). The box and button both seem to be enabled (flashing cursor in the box, and the button responds to clicks by changing visually- but there's no browse dialog.

Just tested in Windows Vista and all seems ok. Tools > Options > General tab Selected 'Play a sound' Selected 'Use the following sound file' click on 'Browse' button Windows Explorer opens a new window called 'Choose sound' allowing me to select where the sound files are located and then selecting a .wav fle and click on 'Open' to insert the file into the text box area.

You could try this: Tools > Options > Advanced > General tab click on 'Config Editor' button In top search type : sound look for these lines:

• mail.biff.play_sound; Value = true
• mail.biff.play_sound.type; Value = 1

• mail.biff.play_sound.url;

double click on that line to open a small window allowing you to enter path where sound file is stored. Try entering the directory location of file: eg: file:///C:/Users/User Account/Music/mail53a.wav

click on Ok close config editor - top right X

reselect General tab to see 'Play a sound' selection. Has it inserted the .wav file ? If yes, click on OK

Toad-Hall: You helped me! I edited the config, but I must've gotten something wrong. (I had copied the config from an Ubuntu machine, and it had a UNC-style file path.) Once I edited it and entered the Windows-style file path, then the Browse function worked and I was able to select the right file. Now it works just as I wish! You also showed me how to troubleshoot strange behavior should it ever arise again.

Thanks very much for your help.

Good to hear all is now working again.