Mciavi32.dll Handle Leak When Opening an AVI File Using MCIWndCreate API

This article was previously published under Q223770
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When Mciavi32.dll uses the MCIWndCreate() API call to open an AVI file, a handle leak occurs.
The MCIWndCreate API opens a handle to the registry key and does not close it, which causes the handle count to increase every time the API is called.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:
Microsoft has confirmed that this is a problem in Windows NT 4.0. This problem was first corrected in Windows NT version 4.0 Service Pack 5.

Article ID: 223770 - Last Review: 11/02/2013 22:55:00 - Revision: 3.0

Microsoft Windows NT Server 4.0 Standard Edition, Microsoft Windows NT Workstation 4.0 Developer Edition

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