Symptoms
Assume that you run an application that creates a topmost window by using the WS_EX_TOPMOST extended window style on a computer that is running Windows 7 or Windows Server 2008 R2. Then, the application calls the SetWindowPos function together with an hwndInsertAfter parameter whose value is set to HWND_NOTOPMOST in order to remove the WS_EX_TOPMOST extended window style from the window. In this situation, the window that no longer has the WS_EX_TOPMOST extended window style can be displayed incorrectly above other windows that have the WS_EX_TOPMOST extended window style.Notes
-
The WS_EX_TOPMOST extended window style specifies that a window that is created that has this style should be displayed above all non-topmost windows, even when the window is deactivated. An application can use the SetWindowPos function to add or remove this extended window style.
-
When an application calls the SetWindowPos function on a window together with the hwndInsertAfter parameter set to HWND_NOTOPMOST, the WS_EX_TOPMOST extended window style is removed from the specified window and any windows that it owns unless the SWP_NOOWNERZORDER flag is set when the SetWindowPos function is called.
Cause
This issue occurs because the z-order position of the windows that are owned by the window that is specified in the SetWindowPos function call is not updated when the WS_EX_TOPMOST extended window style is removed. Therefore, when the computer calculates the new z-order position of a non-topmost window, the last topmost window is returned incorrectly. Because of this behavior, non-topmost windows can be displayed above topmost windows.
Resolution
Hotfix information
Important This hotfix has been re-released to address an issue in which the digital signature on files produced and signed by Microsoft will expire prematurely, as described in Microsoft Security Advisory 2749655. A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:
http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
Prerequisites
To apply this hotfix, you must be running Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1.For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:
976932Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2
Registry information
To apply this hotfix, you do not have to make any changes to the registry.
Restart requirement
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.
File information
The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
-
The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
Version
Product
Milestone
Service branch
6.1.760 1.22xxx
Windows 7 and Windows Server 2008 R2
SP1
LDR
-
The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
|
File name |
File version |
File size |
Date |
Time |
Platform |
|---|---|---|---|---|---|
|
Win32k.sys |
6.1.7601.22061 |
2,354,176 |
19-Jul-2012 |
14:58 |
x86 |
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
|
File name |
File version |
File size |
Date |
Time |
Platform |
|---|---|---|---|---|---|
|
Win32k.sys |
6.1.7601.22061 |
3,151,360 |
19-Jul-2012 |
15:25 |
x64 |
For all supported IA-64-based versions of Windows Server 2008 R2
|
File name |
File version |
File size |
Date |
Time |
Platform |
|---|---|---|---|---|---|
|
Win32k.sys |
6.1.7601.22061 |
7,449,088 |
19-Jul-2012 |
14:53 |
IA-64 |
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More Information
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684Description of the standard terminology that is used to describe Microsoft software updates
Additional file information
Additional file information for Windows 7 and for Windows Server 2008 R2
Additional files for all supported x86-based versions of Windows 7
|
File name |
Update.mum |
|
File version |
Not Applicable |
|
File size |
2,136 |
|
Date (UTC) |
17-Sep-2012 |
|
Time (UTC) |
12:23 |
|
Platform |
Not Applicable |
|
File name |
X86_6955ed7b3079fec14c3f7b9c42f91675_31bf3856ad364e35_6.1.7601.22061_none_c628fcd4c7739a29.manifest |
|
File version |
Not Applicable |
|
File size |
694 |
|
Date (UTC) |
17-Sep-2012 |
|
Time (UTC) |
12:23 |
|
Platform |
Not Applicable |
|
File name |
X86_microsoft-windows-win32k_31bf3856ad364e35_6.1.7601.22061_none_bb4b4dcb1211ecfc.manifest |
|
File version |
Not Applicable |
|
File size |
42,086 |
|
Date (UTC) |
19-Jul-2012 |
|
Time (UTC) |
17:29 |
|
Platform |
Not Applicable |
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
|
File name |
Amd64_3c99383bdab3b2812043655047d0c723_31bf3856ad364e35_6.1.7601.22061_none_14ad20d40a9baa0f.manifest |
|
File version |
Not Applicable |
|
File size |
698 |
|
Date (UTC) |
17-Sep-2012 |
|
Time (UTC) |
12:23 |
|
Platform |
Not Applicable |
|
File name |
Amd64_45fc06894b982fe5c0a4868989038dc3_31bf3856ad364e35_6.1.7601.22061_none_ff6fdb8f32addcfc.manifest |
|
File version |
Not Applicable |
|
File size |
698 |
|
Date (UTC) |
17-Sep-2012 |
|
Time (UTC) |
12:23 |
|
Platform |
Not Applicable |
|
File name |
Amd64_d9e3d12b68934832312f1d4da0eeee58_31bf3856ad364e35_6.1.7601.22061_none_d2efd2a432649ceb.manifest |
|
File version |
Not Applicable |
|
File size |
1,038 |
|
Date (UTC) |
17-Sep-2012 |
|
Time (UTC) |
12:23 |
|
Platform |
Not Applicable |
|
File name |
Amd64_microsoft-windows-win32k_31bf3856ad364e35_6.1.7601.22061_none_1769e94eca6f5e32.manifest |
|
File version |
Not Applicable |
|
File size |
42,090 |
|
Date (UTC) |
19-Jul-2012 |
|
Time (UTC) |
18:19 |
|
Platform |
Not Applicable |
|
File name |
Update.mum |
|
File version |
Not Applicable |
|
File size |
2,773 |
|
Date (UTC) |
17-Sep-2012 |
|
Time (UTC) |
12:23 |
|
Platform |
Not Applicable |
|
File name |
Wow64_microsoft-windows-win32k_31bf3856ad364e35_6.1.7601.22061_none_21be93a0fed0202d.manifest |
|
File version |
Not Applicable |
|
File size |
4,178 |
|
Date (UTC) |
19-Jul-2012 |
|
Time (UTC) |
17:13 |
|
Platform |
Not Applicable |
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
|
File name |
Ia64_52b89d4ebfbaf73ec476d6b850e11c14_31bf3856ad364e35_6.1.7601.22061_none_101da774dac610da.manifest |
|
File version |
Not Applicable |
|
File size |
1,036 |
|
Date (UTC) |
17-Sep-2012 |
|
Time (UTC) |
12:23 |
|
Platform |
Not Applicable |
|
File name |
Ia64_microsoft-windows-win32k_31bf3856ad364e35_6.1.7601.22061_none_bb4cf1c1120ff5f8.manifest |
|
File version |
Not Applicable |
|
File size |
42,088 |
|
Date (UTC) |
19-Jul-2012 |
|
Time (UTC) |
18:15 |
|
Platform |
Not Applicable |
|
File name |
Update.mum |
|
File version |
Not Applicable |
|
File size |
1,447 |
|
Date (UTC) |
17-Sep-2012 |
|
Time (UTC) |
12:23 |
|
Platform |
Not Applicable |
|
File name |
Wow64_microsoft-windows-win32k_31bf3856ad364e35_6.1.7601.22061_none_21be93a0fed0202d.manifest |
|
File version |
Not Applicable |
|
File size |
4,178 |
|
Date (UTC) |
19-Jul-2012 |
|
Time (UTC) |
17:13 |
|
Platform |
Not Applicable |
