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: 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, 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.

Back to the top

Hotfix information

A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

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 name	File version	File size	Date	Time	Platform
Mmdevapi.dll	6.0.6000.20511	146,944	10-Jan-2007	13:47	x86
Update.mum	Not applicable	1,997	11-Jan-2007	00:28	Not applicable
X86_microsoft-windows-mmdeviceapi.d_31bf3856ad364e35_6.0.6000.20511_none_3e521768661e5477.manifest	Not applicable	699	11-Jan-2007	00:28	Not applicable
X86_microsoft-windows-mmdeviceapi_31bf3856ad364e35_6.0.6000.20511_none_539dce4ed560245d.manifest	Not applicable	10,651	11-Jan-2007	00:30	Not applicable

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Amd64_microsoft-windows-mmdeviceapi.d_31bf3856ad364e35_6.0.6000.20511_none_9a70b2ec1e7bc5ad.manifest	Not applicable	703	11-Jan-2007	00:28	Not applicable
Amd64_microsoft-windows-mmdeviceapi_31bf3856ad364e35_6.0.6000.20511_none_afbc69d28dbd9593.manifest	Not applicable	10,679	11-Jan-2007	00:34	Not applicable
Mmdevapi.dll	6.0.6000.20511	202,752	10-Jan-2007	15:04	x64
Package_1_for_kb930883~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not applicable	2,008	11-Jan-2007	00:28	Not applicable
Package_2_for_kb930883~31bf3856ad364e35~amd64~~6.0.1.0.mum	Not applicable	1,787	11-Jan-2007	00:28	Not applicable
Update.mum	Not applicable	1,997	11-Jan-2007	00:28	Not applicable

Back to the top

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

Back to the top

For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base: For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Back to the top