Is it just me, or did they completely rip that off from ICQ? I was uh-ohing and train whistling with ICQ back in 1997, when nobody even heard of WS_FTP. Or are these public domain sounds, or something?
You're right, it's the same sounds. As to whether they "borrowed" them from ICQ, I can't say. If I had to hazard a guess, developers from both groups probably found them in the public domain.
I've already sent them feedback asking that they just use the standard Windows sounds available on the platform that they install on. What they're using sounds really harsh, particularly with Vista's mellow sound scheme.