Converting Video Files to WMV for xbox

[Davedog]

Hey Mac users, first time posting.
I am having trouble finding a free video converter. I wish to convert .mp4, .avi, etc to .wmv so I can watch them on my xbox and hopefully transfer them. I have tried a few converters most that just don't work or are 'trials' and are useless.
Thanks,
David

 

[jdechko]

Is it a 360? I only ask because, the 360 has native support for mp4 files already.