Thanks, Nudel. I had already searched the FAQ and forum, and found a few messages, including this one: resource.dopus.com/viewtopic.php ... audio+play. I did everything I found, and was unable to fix the problem. Windows Media Player Tools-Options-Filetypes was already configured to handle wav files. I unchecked and rechecked the option to see if that would correct things, it didn't.
I also updated to Windows Media Player 11 (was running 10). That didn't fix it either. Any other ideas would be much appreciated!