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When i download a video file and try to play it,i can only hear it and not see it.Can someone help me please?

Your player might be missing codecs. Try playing the file with VLC player, it has codecs installed & can play most things
http://www.videolan.org/vlc/

*Just one thing, you'll have to launch or preview a file by opening your saved folder (or incomplete folder, if you want to preview) outside of LW.