FIX: An application that calls the acmFormatChoose function crashes on a computer that is running Windows Vista

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Article ID: 945438 - View products that this article applies to.
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Consider the following scenario:
  • On a computer that is running Windows Vista, you use Microsoft Office PowerPoint 2007 to record audio, or you use another application to record audio.
  • The application calls the acmFormatChoose function to display a dialog box so that you can select the waveform-audio format.
In this scenario, the application crashes.


The acmFormatChoose function tries to free a pointer that was not allocated.


Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, obtain the hotfix from the Microsoft Download Center.

Download information

The following files are available for download from the Microsoft Download Center:
Windows Vista, 32-bit versions (all languages)
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Download the Windows6.0-KB945438-x86.msu package now.
Windows Vista, 64-bit versions (all languages)
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Download the Windows6.0-KB945438-x64.msu 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.

File information

The global 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.
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File nameFile versionFile sizeDateTimePlatform


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


Typically, this problem occurs only on Japanese systems. On platforms in other languages, this problem may occur only when you run the application that uses the acmFormatChoose function inside a debugging application.

Steps to reproduce the problem

  1. Start PowerPoint 2007.
  2. On the Slide Show menu, click Record narration.
  3. Click Change quality.
  4. Click Save as.
  5. Close the dialog boxes that are open.


Article ID: 945438 - Last Review: January 8, 2008 - Revision: 1.1
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
  • Windows Vista Business 64-bit Edition
kbvistasp1fix kbfix KB945438

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