Play a .g64 file extension
.g64 is the extension of the proprietary video format from Genetec, a provider of IP video surveillance. Even 5 years after your question I have not found any library to open them or player to read them other than the official player. Not sure where to find it, part of their doc is behind a login wall. You might try http://downloadcenter.genetec.com/products/SecurityCenter/GenetecVideoPlayer/GenetecVideoPlayer.exe