Errors may occur when you run a 32-bit program on a computer that is running a 64-bit version of Windows Server 2003 or on a computer that is running Windows XP Professional x64 Edition (911021)
The information in this article applies to:
- Microsoft Windows Server 2003, Standard x64 Edition
- Microsoft Windows Server 2003, Enterprise x64 Edition
- Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
- Microsoft Windows XP Professional x64 Edition
SYMPTOMSConsider the following scenario. You have a computer that is
running a 64-bit version of Microsoft Windows Server 2003 or a computer that is
running Microsoft Windows XP Professional x64 Edition. You run a 32-bit program
that has the /LARGEADDRESSAWARE switch enabled. You run this program in a Windows on Windows 64
(WOW64) environment. When this scenario occurs, you may experience one or more
of the following symptoms.Symptom 1 An access violation may occur when you run the program.Symptom 2An access violation may occur when the program calls a
CreateWindow API that has string-window class name specified.Symptom 3A hooked function may not be called correctly. This may cause
various graphical user interface (GUI) operations not to work. Additionally, an
access violation may occur.Symptom 4The MessageBox API may not work correctly. This may cause GUI
items that use the MessageBox API not to work correctly.CAUSEThe symptom that is described in the "Symptom 1" section may
occur if the Wow64win.dll file incorrectly evaluates a WinProc function that
has an address that is larger than 0xC0000000. The UserCallWinProcCheckWow
routine evaluates the highest two bits of the WinProc function as flags that
have a special meaning. Then, this routine runs the wrong code
path. The symptom that is described in the "Symptom 2" section may
occur if the operating system inappropriately converts a 32-bit pointer to a
64-bit pointer. The symptom that is described in the "Symptom 3"
section may occur if an incorrect thunk operation occurs in the Wow64win.dll
file. This operation may occur when the following conditions are true:
- The Wow64win.dll file tries to convert a 32-bit pointer to
a 64-bit pointer.
- The 32-bit pointer has an address that is located between
0x80000000 and 0xFFFFFFF.
When this incorrect thunk operation occurs, the 32-bit pointer
is converted to a 64-bit pointer that is sign extended. The symptom
that is described in the "Symptom 4" section may occur if there is an
inappropriate conversion from a 32-bit address pointer to a 64-bit address
pointer. RESOLUTIONUpdate information
The following files are available for download from the Microsoft
Download Center: Windows Server 2003, 64-bit x64-based versions Download the WindowsServer2003.WindowsXP-KB911021-x64-ENU.exe package now.Windows Server 2003, 64-bit Itanium-based versions with Service Pack
1 Download the WindowsServer2003-KB911021-ia64-ENU.exe package now.Windows XP Professional x64 Edition Download the WindowsServer2003.WindowsXP-KB911021-x64-ENU.exe 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.
PrerequisitesTo apply this update on a Windows Server 2003-based computer, you must have Windows Server 2003 Service Pack 1 (SP1) installed on the computer. Restart requirementYou must restart the computer after you apply this update. Update replacement informationThis update does not replace any other updates or hotfixes. File information
The English version of this update 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 tool in Control Panel. Windows Server 2003, 64-bit x64-based versions and Windows XP Professional x64 Edition |
Fxsapi.dll | 5.2.3790.2615 | 528,384 | 12-Jan-2006 | 01:50 | x64 | SP1 | SP1QFE | Gdi32.dll | 5.2.3790.2615 | 609,792 | 12-Jan-2006 | 01:50 | x64 | SP1 | SP1QFE | User32.dll | 5.2.3790.2615 | 1,085,952 | 12-Jan-2006 | 01:50 | x64 | SP1 | SP1QFE | Uxtheme.dll | 6.0.3790.2615 | 505,856 | 12-Jan-2006 | 01:50 | x64 | SP1 | SP1QFE | Wow64win.dll | 5.2.3790.2615 | 286,720 | 12-Jan-2006 | 01:50 | x64 | SP1 | SP1QFE | Wfxsapi.dll | 5.2.3790.2615 | 467,456 | 12-Jan-2006 | 01:50 | x86 | SP1 | WOW | Wgdi32.dll | 5.2.3790.2615 | 285,184 | 12-Jan-2006 | 01:50 | x86 | SP1 | WOW | Wuser32.dll | 5.2.3790.2615 | 602,112 | 12-Jan-2006 | 01:50 | x86 | SP1 | WOW | Wuxtheme.dll | 6.0.3790.2615 | 215,040 | 12-Jan-2006 | 01:50 | x86 | SP1 | WOW |
Windows Server 2003, 64-bit Itanium-based versions with Service Pack 1 |
Fxsapi.dll | 5.2.3790.2615 | 727,552 | 12-Jan-2006 | 01:50 | IA-64 | SP1 | SP1QFE | Gdi32.dll | 5.2.3790.2615 | 907,264 | 12-Jan-2006 | 01:50 | IA-64 | SP1 | SP1QFE | User32.dll | 5.2.3790.2615 | 1,476,096 | 12-Jan-2006 | 01:50 | IA-64 | SP1 | SP1QFE | Uxtheme.dll | 6.0.3790.2615 | 556,032 | 12-Jan-2006 | 01:50 | IA-64 | SP1 | SP1QFE | Wow64win.dll | 5.2.3790.2615 | 581,120 | 12-Jan-2006 | 01:50 | IA-64 | SP1 | SP1QFE | Wfxsapi.dll | 5.2.3790.2615 | 467,456 | 12-Jan-2006 | 01:50 | x86 | SP1 | WOW | Wgdi32.dll | 5.2.3790.2615 | 285,184 | 12-Jan-2006 | 01:50 | x86 | SP1 | WOW | Wuser32.dll | 5.2.3790.2615 | 602,112 | 12-Jan-2006 | 01:50 | x86 | SP1 | WOW | Wuxtheme.dll | 6.0.3790.2615 | 215,040 | 12-Jan-2006 | 01:50 | x86 | SP1 | WOW |
STATUSMicrosoft
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section.
Modification Type: | Minor | Last Reviewed: | 7/26/2006 |
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Keywords: | kbBug kbfix kbHotfixServer kbQFE kbpubtypekc KB911021 kbAudITPRO |
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