Windows Media Player
is Microsoft's media player tailored for Mac users. It allows you to easily play music and movies in all audio and video formats released before 2005. (New Windows formats can be read using QuickTime or Flip4Mac.)
Note: The download works fine but Windows Media Player for Mac is no longer offered by Microsoft since 2003. For later video formats released after 2005, you can use QuickTime of Flip4Mac).