habibz, just to add with taposhbhai, you can watch the preview by using vlc player, but for that you have to close the torrent client. When a torrent client is running, it locks the file so that other program cannot run it. So, close the torrent client and you can watch the preview with vlc player (only for mpeg and dat files).

BUT, you will see different chunks of the drama as it does not download the full thing serially.

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