To decode use a recent build of FFDShow or a player that supports H.264 internally like MPlayer (there are few interesting frontends for Windows: MPlayerUI, MPlayer Frontend) and VLC (VideoLAN Client).

x264 Full package come with an installer and contains both VFW and CLI with MeGUI.

Microsoft .NET Framework 2.0, AVISynth and DGIndex are required to use MeGUI but NOT included. Learn more.