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Article 0079
WMV Components
Subject: QuickTime 7.5.5: Mail not able to play embedded/attached WMV files
Date: 12/16/08

With QuickTime 7.5.5 installed, emails that contain Windows Media movie files, which previously were viewable - embedded within the email, will not play properly (you will only hear the audio). In order to view the video, you will need to double click on the video or drag the file to your hard drive and open it in QuickTime Player.

Update to O/S 10.5.6 to fix this issue.