How To Play FLV Files?

Media Player Classic or VLC.

"The open source KMPlayer will play FLV (along with pretty much everything else) without having to install additional codecs. Looks good too.
It's reviewed on the Gizmo's Freeware site."
"The open source KMPlayer will play FLV (along with pretty much everything else) without having to install additional codecs. Looks good too.
It's reviewed on the Gizmo's Freeware site."

VLC as well as Media Player Classic do the job just fine.

"Desktop-based FLV player:

Microsoft Windows, Mac OS X, Unix-based
Adobe Media Player (freeware)
Media Player Classic (free software)
MPlayer (free software)
RealPlayer (freeware)
VLC media player (free software)
Winamp (freeware)"