Microsoft has released an update for Windows Media Player 11 for Windows Vista

SYMPTOMS
Consider the following scenario:
- In Microsoft Windows Media Player 11, you use a metafile playlist to stream audio or video content. For example, you use an ASX file.
- The length of the content is 30 minutes or more.
- The playlist contains a duration element for the content that you are playing.

In this scenario, the content plays longer than the time that is specified by the duration element in the playlist.

CAUSE
This issue occurs because Windows Media Player uses approximate seeking when it plays back certain types of content that are longer than 30 minutes. When Windows Media Player uses approximate seeking, the underlying framework ignores the set duration element.

RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

Update for Windows Media Player 11 for Windows Vista (KB931756)