1. All the videos downloaded are in flv(flash video) format

2. flv player should be installed in your system to play this video ( Eg: VLC player ,Riva FLVplayer ,Wimpy etc.. )

3. click here to download free flv player

All YouTube videos are stored in Flash Video Format. In order to play it, you must save the file with *.flv extension first and then use flv video player below to play it.

Player

• FLV Video Player
  FLV Player is a standalone application to play Flash .flv files with. This utility can come in handy when viewing many FLV files, as it doesn't require the Flash IDE. The installer comes with optional .flv association, so double clicking an .flv file opens and plays the file in the player.
  
  
• Wimpy Standalone FLV Player
  Here's a free cross platform (Mac and PC) standalone Flash Video FLV player for you, which will allow you to watch your FLV and SWF videos from your desktop.