Hey can anyone help me its not really really bad but its annoying.

I got limewire a couple of days ago and it was all good and i got a couple of videos, but not whenever i try to get more, they download as files so i cant preview them, and it doesnt say their name so there is no way to know what they are. Most of them turn out to be ads or nothing to do with what it said. When i resume cancelled downloads they are good but the others are unpreviewable.

Can someone tell me how to make them the same thing as they are when I begin the dowload from the main bit. Thanks