There are so many movies coming round in junk emails these days that you may be happy you can’t play WMV or AVI files on your mac. But just in case you do need to actually look at one, here’s how.
There is a simple free movie player called VLC and the aim of the people who develop it is to let you play any kind of movie file! It’s not quite as good looking as Quicktime Player (the built in Apple movie player), but it can play movies that Quicktime Player can’t play, like Windows WMV files or AVI files plus a lot more. VLC can also stream a movie to Apple TV, which is crippled in the Apple DVD player. (It just sends a grey screen to Apple TV.)
You can download the latest version of VLC from http://www.videolan.org
Install it into your Applications folder, and then use it whenever you need to play a WMV movie.