No, they still have the WAV extension. Try this file; you should be able to play it using Windows Media Player but it won't load into Carrara. Be sure to change the extension to WAV. I saved it from my audio editing program (Goldwave - excellent and inexpensive! www.goldwave.com) using the Wave MPEG Layer-3 8kBit/s, 8,000Hz, Mono option, which is the lowest sampling rate so it sounds crappy. It is some applause (clapping). MP3 is the same compression method but a different file format (in other words, different encoding of the binary). And all this makes no difference to Carrara's output - you can't render to AVI with sound. :(