How about a QUICKIE tutorial on making videos for use in MXM?
Starting with a *.bik file, which is a Bink video. These are horribly WASTEFUL video files - I don't understand why developers are using that over WMV/XMV, but whatever...
Get the radtools from www.radgametools.com - they're free.
Pull up the Rad Video Tools and select the BIK file you wish to use.
Convert to AVI - don't do anything else to it, just convert it, preferably using Cinepack as the codec.
While it's in AVI, edit it as you desire (chop it up, add to it) and make sure it has PCM audio attached to it (needed, at the moment). The PCM audio can be something like a silent audio clip, and can be of low quality, since it won't actually be heard.
Now, you must use Windows Media 8 Encoding tools.
At the command prompt:
wm8eutil -input attract.avi -output Mech.wmv -v_mode 2
The above is an example of converting the attract.bik file (from MechAssault), converted to attract.avi to make Mech.wmv
Then drop the resulting file somewhere on your compilation and point your Game Entry "Media" value to it.
The BIK started out as a 22MB file, converted to a 106MB AVI, then down to a 9MB WMV file, unedited.