The "DwmEnableBlurBehindWindow" function does not work correctly for a non-rectangular window in Windows 7 and in Windows Server 2008 R2

Applies to: Windows 7Windows Server 2008 R2

Symptoms


Consider the following scenario:
  • You use an Aero theme for the desktop on a computer that is running Windows 7 or Windows Server 2008 R2.
  • You use the DwmEnableBlurBehindWindow function to enable a blur effect on a window of an application. The shape of the window is not rectangular.
  • You minimize and then restore the window.
  • You resize the window.
In this scenario, the blurred area of the window does not resize correctly.

Resolution


Hotfix information

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 Web site: Note 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

There are no prerequisites.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to 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 MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. 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 nameFile versionFile sizeDateTimePlatform
Dwm.exe6.1.7600.2075892,67218-Jul-201008:43x86
Dwmredir.dll6.1.7600.2075897,28018-Jul-201008:44x86
Microsoft-windows-desktopwindowmanager-core-ppdlic.xrm-msNot applicable3,57318-Jul-201008:55Not applicable
Uxsms.dll6.1.7600.2075829,69618-Jul-201008:45x86
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Dwm.exe6.1.7600.20758120,32018-Jul-201009:21x64
Dwmredir.dll6.1.7600.20758128,51218-Jul-201009:24x64
Microsoft-windows-desktopwindowmanager-core-ppdlic.xrm-msNot applicable3,57318-Jul-201009:38Not applicable
Uxsms.dll6.1.7600.2075838,91218-Jul-201009:27x64
For all supported IA-64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Dwm.exe6.1.7600.20758234,49618-Jul-201008:06IA-64
Dwmredir.dll6.1.7600.20758254,46418-Jul-201008:09IA-64
Microsoft-windows-desktopwindowmanager-core-ppdlic.xrm-msNot applicable3,57318-Jul-201008:24Not applicable
Uxsms.dll6.1.7600.2075878,84818-Jul-201008:14IA-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 the DwmEnableBlurBehindWindow function, visit the following Microsoft website:For more information about the blur effect, visit the following Microsoft website:For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description 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 nameX86_b61f6ad1667677d609f9f67dc1b75345_31bf3856ad364e35_6.1.7600.20758_none_44522f361cea605c.manifest
File versionNot applicable
File size713
Date (UTC)19-Jul-2010
Time (UTC)19:02
PlatformNot applicable

File nameX86_microsoft-windows-d..pwindowmanager-core_31bf3856ad364e35_6.1.7600.20758_none_8e26fd5737882019.manifest
File versionNot applicable
File size14,354
Date (UTC)18-Jul-2010
Time (UTC)09:19
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
File nameAmd64_53f201225ca969698a2e9119868aa7eb_31bf3856ad364e35_6.1.7600.20758_none_e87a4e1cd5273592.manifest
File versionNot applicable
File size717
Date (UTC)19-Jul-2010
Time (UTC)19:02
PlatformNot applicable

File nameAmd64_microsoft-windows-d..pwindowmanager-core_31bf3856ad364e35_6.1.7600.20758_none_ea4598daefe5914f.manifest
File versionNot applicable
File size14,360
Date (UTC)18-Jul-2010
Time (UTC)10:20
PlatformNot applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
File nameIa64_90b8f832b264aa1fbea1008a0bc2091e_31bf3856ad364e35_6.1.7600.20758_none_5396d1e6dc41aa4e.manifest
File versionNot applicable
File size715
Date (UTC)19-Jul-2010
Time (UTC)19:02
PlatformNot applicable

File nameIa64_microsoft-windows-d..pwindowmanager-core_31bf3856ad364e35_6.1.7600.20758_none_8e28a14d37862915.manifest
File versionNot applicable
File size14,357
Date (UTC)18-Jul-2010
Time (UTC)10:15
PlatformNot applicable