FLV is now almost the industry standard file for almost every Video sharing site. These files are usually not downloadable, however with the help ofsome software or browser plugins, these videos can also be downloaded. Once that is done however, some people dont really know what to do with these FLV files since if you load them up to your windows media player, they dont work.
If you want to play the FLV files, you will need to make use of third party software. There are plenty of solutions and plenty of software you can find, however if you want to play those files in Windows Media Player, you can download Play FLV, an extention for Windows Media player that enables you to run FLV files with just a double click like any other supported files. you can download Play FLV from HERE. its only 300k!