nullsoft video /fake file

ok I downloaded a movie it had 700 mb but when I previewed it ,it had a black screen with a nullsoft video in the middle is this a fake file? there sure is a lot of fake files and porn on this, how do you get around all this junk? thanks.

preview the file after say 2-3% has downloaded; if it's fake ditch it. Save the disappointment of a long download. Vlc media player will allow you to preview partial .avi file types

I will do that from now on preview it first .it really bites when you think you have a good movie and there's nothing on it or porn.but this will help.thanks