Movie Maker V1 used a DV-AVI format known as Type-II -- DV-AVI Type-II
contains a second redundant audio track for compatiblity with older programs
that use the "Video For Windows" programming interfaces developed for Windows
3.1.
Movie Maker V2 uses the DV-AVI format known as Type-I -- which doesn't
contain this secondary audio track. DV-AVI Type-I is essentially an exact
copy of the data from the mini-DV tape wrapped in an AVI file. This change
was made to more effciently support the Movie Maker V2 back to tape feature.
There a number of freeware converters out there: here is one
http://www.stoik.com/downloads/downloads_frm.htm
If you want to understand more details about this issues; there is a long
discussion here:
http://www.windowsmoviemakers.net/Forums/ShowPost.aspx?PostID=3799
