Article ID: 289226
This article was previously published under Q289226
When you try to play a non-PCM (Pulse Code Modulation) WAV audio file on a Windows 2000 computer with WDM (Windows Driver Model) audio drivers installed, no sound is produced.
Troubleshooter: No audio in Windows
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This behavior occurs because the Wdmaud.drv (WDM Audio Driver Mapper) file interfaces with Kmixer.sys (Kernel Mode Audio Mixer), which supports only the PCM audio format.
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/260910/EN-US/ )How to Obtain the Latest Windows 2000 Service Pack
To work around this behavior, install non-WDM drivers for your audio device.
Microsoft has confirmed that this is a problem in Microsoft Windows 2000.
This problem was first corrected in Windows 2000 Service Pack 2.
Devices such as software-based DVD players require the use of non-PCM audio formats to play content like AC3 (Dolby Digital 5.1) audio.