Hoi, One difference with pictures is, that when you save a screen with a picture on it, you save the picture at the same time. When you save an "image" with a sound, you do NOT save the sound at the same time. The problem is that when people prepare their computer to use .ogg files. One stage is to check if you can hear .ogg files locally. This means that you have to HAVE an .ogg file.
Yesterday I mentioned that sounds being "Image"s for wikimedia is counterintuitive, today I ask for a Sound detail screens which has the option to download the sound,
Thanks, GerardM