Flv player to Enable WMP to play FLV files

The sharing video on the internet sites, such as Google Video, YouTube, MetaCafe, can download as the flv file format. But how can I Play .FLV Files in Windows Media Player in Windows 7 by simply?

I find a windows 7 flv player which call PlayFLV. And PlayFLV is free and open source. With lightweight PlayFLV Plugin, you can enable Windows Media Player to playback FLV files easily. After installtion, just double-click the FLV file and you can view them in Windows Media Player. So you with no extra player apps in Windows 7.

Download PlayFLV

Update: I've use Real Player to play FLV files in Win7 for a long time. It works great.
And instead of Real Player, I try VLC Player and also works well.