The QueryDosDevice function succeeds even if you specify a small buffer that cannot hold all returned information on a computer that is running an Itanium-based version or an x64-based version of Windows Server 2003 (922931)

SYMPTOMS

Consider the following scenario:

You use a custom application on a computer that is running an Itanium-based version or an x64-based version of Windows Server 2003.
The custom application uses the QueryDosDevice function to retrieve information about MS-DOS device names.
The custom application or a driver uses a small buffer that cannot hold all the information about the MS-DOS device names.

In this scenario, the QueryDosDevice function always succeeds, even if you specify a small buffer that cannot hold all returned information. You expect the function to fail and to return a value of zero. The GetLastError value should be ERROR_INSUFFICIENT_BUFFER. However, no error code is set. The return value is the number of TCHARs that are stored in the buffer.

RESOLUTION

Windows Server 2003 hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

To apply this hotfix, the computer must be running one of the following operating systems:

An Itanium-based version of Windows Server 2003
An x64-based version of Windows

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

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 Server 2003, x64-based versions

File name	File version	File size	Date	Time	Platform
Wow64.dll	5.2.3790.2758	250,368	27-Jul-2006	14:33	x64

Windows Server 2003, Itanium-based versions

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Wow64.dll	5.2.3790.568	449,536	27-Jul-2006	14:22	IA-64	None	RTMQFE
Wow64.dll	5.2.3790.2758	497,152	27-Jul-2006	14:39	IA-64	SP1	SP1QFE

MORE INFORMATION

For more information about the QueryDosDevice function, visit the following Microsoft Web page:

http://windowssdk.msdn.microsoft.com/en-us/library/ms687572.aspx

For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

816915 New file naming schema for Microsoft Windows software update packages

824684 Description of the standard terminology that is used to describe Microsoft software updates

Technical support for Windows x64 editions

Your hardware manufacturer provides technical support and assistance for Microsoft Windows x64 editions. Your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation with unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with your Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware.

For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site:

http://www.microsoft.com/windowsxp/64bit/default.mspx

For product information about Microsoft Windows Server 2003 x64 editions, visit the following Microsoft Web site:

http://www.microsoft.com/windowsserver2003/64bit/x64/default.mspx