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Article ID: 835861 - Last Review: September 27, 2011 - Revision: 3.0

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When you encode MPEG4 content on dual processor computers or on computers that support hyper-threading, an incorrect flag may be set in the header of the content file. Because of this incorrect flag, Windows Media Player and various devices cannot play back the content file.


The following files are available for download from the Microsoft Download Center:


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Download the WindowsMedia-KB835861-ENU.exe package now. (


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Download the WindowsMedia-KB835861-JPN.exe package now. (
For more information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591  ( ) How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version            Size    File name
   09-Oct-2002  17:21       566,272  Wmvdmoe.dll    


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Currently, the packages are available in the languages that are listed earlier in this article. If you require packages for additional languages, please contact Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:;[LN];CNTACTMS (;[LN];CNTACTMS)
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.


The fix will install only on Microsoft Windows XP-based computers that have the previous version of the MPEG4 encoder installed. If the previous version of the MPEG4 encoder is not installed, or if an updated MPEG4 encoder was installed by a third-party application, you may receive an informational message to the effect during the installation.

For more information about MPEG4 licensing, click the following article number to view the article in the Microsoft Knowledge Base:
819758  ( ) Windows Media Tools 4.1 not available in Windows 2000 service pack

  • Windows Media Encoder 9 Series
kbhotfixserver kbqfe kbdownload KB835861
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