Programs that play audio stop working and duplicate entries appear in the Default Format audio format list in Windows Vista


You open the properties dialog box for an audio device in the Sound control panel on a Windows Vista-based computer. You may then find that duplicate entries are listed in the Default Format list on the Advanced tab of the properties dialog box. Also, when you select one of the entries, and then click Test, you may receive an error message that resembles the following:

Failed to play test tone
Note You may receive a different error message, depending on your hardware.

After this problem occurs, you may be unable to use other programs that play audio. For example, programs such as Windows Media Player or Windows Media Center do not play sounds correctly.

This problem may occur after you change the entry in the Default Format list for the device. To open the Default Format list for the device, follow these steps:
  1. Click Start Start button  , type mmsys.cpl in the Start Search box, and then click mmsys.cpl in the Programs list.
  2. Click an audio device that is listed, and then click Properties.
  3. Click the Advanced tab, and then note the items that are listed in the Default Format list.


Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
935791 How to obtain the latest Windows Vista service pack

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

File information

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 item in Control Panel.
Windows Vista, x86-based versions
File nameFile versionFile sizeDateTimePlatform
Update.mumNot applicable1,99711-Jan-200700:28Not applicable
X86_microsoft-windows-mmdeviceapi.d_31bf3856ad364e35_6.0.6000.20511_none_3e521768661e5477.manifestNot applicable69911-Jan-200700:28Not applicable
X86_microsoft-windows-mmdeviceapi_31bf3856ad364e35_6.0.6000.20511_none_539dce4ed560245d.manifestNot applicable10,65111-Jan-200700:30Not applicable
Windows Vista, 64-bit versions
File nameFile versionFile sizeDateTimePlatform
Amd64_microsoft-windows-mmdeviceapi.d_31bf3856ad364e35_6.0.6000.20511_none_9a70b2ec1e7bc5ad.manifestNot applicable70311-Jan-200700:28Not applicable
Amd64_microsoft-windows-mmdeviceapi_31bf3856ad364e35_6.0.6000.20511_none_afbc69d28dbd9593.manifestNot applicable10,67911-Jan-200700:34Not applicable
Package_1_for_kb930883~31bf3856ad364e35~amd64~~ applicable2,00811-Jan-200700:28Not applicable
Package_2_for_kb930883~31bf3856ad364e35~amd64~~ applicable1,78711-Jan-200700:28Not applicable
Update.mumNot applicable1,99711-Jan-200700:28Not applicable


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.

More Information

For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Related Information:

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Music and sound help with Windows 7

ID článku: 930883 - Poslední kontrola: 21. 6. 2014 - Revize: 1

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