Class not registered

From: Gary (anonymous_at_discussions.microsoft.com)
Date: 03/29/04 

Date: Mon, 29 Mar 2004 08:37:33 -0800

When I download a video file, sometimes it won't play on
Windows media player and states that the "Class is not
registered". How can I play this file. It happens mostly
with avi files but they are listed as playable in WMP.

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