If you try to play with a vídeo (edit) using VirtualDub and get a message saying you need a decoder for H264, just download and install x264vfw. Before installing close VirtualDub, install x264vfw and run VirtualDub again. In my case i got a sync message but video loaded on VirtualDub so i could save just video and no audio...
btw, i was playing with avidemux but it was saving only vídeo as raw file and i had no idea how to append avis with that raw file after, so i choosed to get audio out and just save another avi file with VirtualDub.
Remember: At least is what i believe ;-) Anything found on Sourceforge.net is good!!! :-)