Flash® Video (FLV) is a file format used to deliver video over the Internet using Adobe® Flash Player. FLV video files are loaded and played inside existing Flash movies; thus Adobe Flash Player requires them to be physically available on the hard disk.
IE publications have native support for Flash Video files: they should play normally. See this option if it does not work.
You can get the player here. Note: the player is licensed under a Creative Commons License. It allows you to use, modify and redistribute the script, but only for noncommercial purposes. For corporate use, please apply for a commercial license.
You can get the player here. Note: Jaris is licensed under GPL and LGPL, meaning that you could use it for commercial use.
Other players such as FLV Player, Any FLV Player... should work too.
Important: very large video files may not work properly: in fact, video files may not play on computers with restrictions on the space dedicated to the Temporary Internet Files folder. Please also keep in mind that video files must be unpacked to the hard disk in order to be played.