You don't.
You can download VLC from the the VLC website, in the Related links below.
http://www.videolan.org/vlc/
The "SFV" stands for "Simple File Validator" and is used to check the integrity of files. So, you cannot play it using VLC Media Player.
VLC is a player not a format a .vlc data file will require the VLC player. The VLC player will play most formats (See links below) and can save files in another format as required.
VLC Media Player
A .mkv file is a High Definition video file. If you're having trouble opening the file try using VLC Media Player. It's free and can be downloaded here: http://www.videolan.org/vlc/
The best avi player is "VLC media player" i preffer using this because, it plays every movie file. It really gives a high quality images. You can get it from http://www.videolan.org/vlc/.
VLC, definitely.
advantages of using ICT
jaasassasas
VLC- Vedio Lan Client