I doubt they're sound files. They're more likely one of these: 3D Animations Macro Corel Motion 3D Animation Since I probably got them from a Japanese site, it's possible that they're not what I thought they'd be since I cannot read the language and didn't use a translation. Unfortunately, without a readme, there's no way to figure out where I found them. I just checked the date I downloaded them and it was a year ago.