I have two computers, both running Windows XP and Windows Media Player version 9. One machine plays both the audio and video when I double-click a .m2v file. The other machine just plays the video. Both machines have both the .m2v and .wav files. Is there some configuration option in WMP I'm missing? This doesn't make sense.
Thanks,

Are you saying that one player actually plays both the M2V (video
only stream) and the WAV *together*? I've never heard it doing
that before.

Keep in mind that the WMP normally doesn't know how to play-
back mpeg2 video. You need to have an mpeg2 codec installed
(which most people have due to DVD software being installed).

I'm not sure what you are getting at with the WAV in this whole
story.

>Are you saying that one player actually plays both the M2V (video
>only stream) and the WAV *together*? I've never heard it doing
>that before.
Yes

Both machines have DVD drives and will play DVDs
WMP can play DVDs on both machines.

On the machine that won't play .m2v the default DVD player is PowerDVD on the other it's WMP

I looked at the video codecs installed on both machines...

Cinepak Codec by Radius, Inc.
Indeo codec by Intel
iyuv_32.dll
Microsoft RLE Codec
msh261.drv
msh263.drv
msyuv.dll
tsbyuv.dll

Plus "Matrox Codecs" are on the one that will play. So maybe this is the key. (It has a Matrox RT.X100 board, Premiere Pro, and Parahelia)

>I'm not sure what you are getting at with the WAV in this whole
story.
I just want to play video and audio when I double-click a .m2v file.

I guess I need to buy a DVD plug-in for WMP.

Thanks for your help,

I can't help you further. I've never heard or seen anything that
worked like that. Must be some feature of the DVD player indeed.
WMP uses the DVD filters to playback mpeg2.