After retransferring it, I see that ResEdit shows that it does have a resource fork with a few icons and that's it. Opening the original file using a text editor shows that the first few dozen bytes look just like a typical JPEG file but there must be a proprietary format after the end of the first image where the rest of the images and sound file reside. That's where I'm stumped...not sure how to get the sound file out.

Quicktime, MPEG Streamclip, Preview, and a few other programs can't see anything beyond the first image.

I have it posted online. Let me know if you want a URL to try downloading it and analyzing it.