if its a video it cant be wma it has to be wmv wma is audio only not video heres a good converter tha you can take the sound off a video.its free too
http://www.softpedia.com/get/Multimedia/...
How do convert a mswmm file to wma for youtube?
Make WMV not WMA
I've made these YouTube videos to answer questions just like yours.
Please check them out: (Jump to Part 2)
Part 1
http://www.youtube.com/watch?v=4lrGpwaz_...
Part 2
http://www.youtube.com/watch?v=NmLWlpCcT...
also see my Movie Maker Tips:
http://www.youtube.com/watch?v=FXA9nSQVQ...
How do convert a mswmm file to wma for youtube?
try the fast and free "youconvertit" http://search.live.com/results.aspx?q=yo... , it converts many formats online, and no need to install anything. it's totally free. if you wish, it can send files only with no conversion.
it downloads youtube videos, or converts them online. it also convert units