First of all, it's not a WMA, its a WMV, its WMV b/c it's a video file, not a music file. I don't think you can get it to work, cuz this is what it says on apple's site
"Videos that were not purchased from the iTunes Music Store are typically not in a format that is playable on the iPod, but in many cases, they can be converted to the correct format using QuickTime 7 Pro. To find out how to convert a movie to one of these formats, see the Creating Video for iPod tutorial, then add the converted video to your iTunes Library. If you're using a Mac with QuickTime 7.0.3 or later installed, you can use iMovie and other applications to export a movie to a format supported by the iPod and then add it your iTunes Library. Click here for an iMovie HD tutorial."
so i think ur SOL.... sorry, sweet vid tho