not too sure, since I am currently taking a hiatus from full subscriber.. but you can get free FLV players from various sources. The one I use for Windows is http://applian.com/flvplayer/ whether or not this is actually the best or not, I have no idea.

If you use Firefox as your browser, you can also get a plug-in/extension called "DownloadHelper" which will allow you to easily grab FLV files from places such as YouTube.. I assume it would also work with GT FLVs as well but I haven't tested it.