iviaudio.ax - is v2.6 the best choice?

I just found that WinDVD 4 is able to show Divx avi files with the right aspect ratio on fullscreen. However I think 4-speaker surround is still not working, even I can choose it in the WinDVD settings. But no matter what I choose, it always sounds the same, more like stereo and no surround at all. The only reference I have is the sound from PowerDVD which sounds really, really good with Pro Logic 4 speaker surround - WinDVD doesn't seem to do it that good (or not at all?)

theReal when use v2 I could not use 4spk, when use v4 - all well. I use v4! ALL work!

@Wilbert Yes, i only registered the demuxer (mpeg2dmx.ax) and the ac3 decoder (mlcom.ax) and it works like a charm.

I didn't register the demuxer. So there is still hope for me :)