Just upgraded to WMP version 11.0.5721.5145. After WMP11 upgrade I installed
WMEncoder 9 codec pack. Also installed GSPot270A to discover the audio and
video codecs on my laptop. WinXP Control Panel reveals that 14 video codecs
are on laptop. GSPot shows 288 audio and video codecs on laptop. Still,
WMP11 does not recognize .mp4 file format. Also, WMP11 plays .avi file as
audio file with no video. What do I need for WMP11 to play .mp4 and .avi?