You'll see the file type on the search page in the 'type' column. When the file's in the download pane, if you hover your mouse over the movie title you'll see the type there as well.

ok I need an advice. I have downloaded an episode of ***** **** and my anti virus has pick up nothing harmful in the file, how ever when I tried to play the vedio clip on my windows media player it said, "The file you are attempting to play has an extension that does not match the file format. Playing the file may result an unexpected behavior." What should I do? Is it ok for me to play the vedio and wont cause any harm to my computer? Is it possible i may recieve a virus if i do play it?
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Edited to comply with the House Rules.
Warez, copyright violation, or any other illegal activity may NOT be linked or expressed in any form.

If you've scanned the file with a good AV then you should be ok.

You might need codecs for your player. Click on the link below, it has more links to codecs & also the free VLC player. VLC has codecs installed & plays most file types. If you want to try it, just choose the nearest mirror for download.
Codecs & VLC

Only thing is...if you use VLC you won't be able to preview or launch a file from within LW. To launch a completed file, go to your LW library, click on Saved Files then click Explore. Your saved folder will open & you can launch from there.
For previewing, click on Incompletes then Explore & you can preview from the opened incomplete folder.