Flip4Mac is endorsed by Microsoft. Microsoft provides server space from which the codec can be downloaded. However, Flip4Mac is produced by Telestream, not Microsoft.
As far as I know, Codec 3.6.2 is a part of DivX. You imply that you have installed DivX. Which version did you install?
The Flip4Mac WMV Component is a codec that brings WMV-compatibility to QuickTime. I have Flip4Mac installed and recommend that you install it as well. However,...