mp4 video files

[deligeorgis]

Why does my Winamp 5.1 not play audio on my *.MP4 (nero digital format) video files created by Nero Recode 2?
Video is ok.
Seeking bar not working too.
Before I added "MP4" in the list, the audio and seek bar was ok, but without video. (Really funny!)

DirectShow Decoder current list: MPG;MPEG;M2V;AVI;ASF;WMV;DAT;VOB;MP4
The rest of the file types work just fine.
DivXs, XviDs also ok.
MP4 Demuxer (in_mp4.dll) installed but... not configurable?

PS: I didn't expect Dsp/Effects to work with VOBs (...Great!)