This article describes an issue in which a memory leak occurs in Desktop Window Manager (dwm.exe) in Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1. An update is available to resolve this issue. Before you install this update, check out the Prerequisites section.

Symptoms

This issue occurs if an application displays various status windows for a long time. DWM leaks memory that is associated with these status windows. Eventually, the application cannot update warning or error status messages in the status windows.

How to obtain this update

Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as an Optional update on Windows Update. For more information on how to run Windows Update, see How to get an update through Windows Update.

Method 2: Microsoft Download Center

The following files are available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 7

Download Download the package now.

All supported x64-based versions of Windows 7

Download Download the package now.

All supported x64-based versions of Windows Server 2008 R2

Download Download the package now.

All supported IA-based versions of Windows Server 2008 R2

Download Download the 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.

Update detail information

Prerequisites

To install this update, install Service Pack 1 for Windows 7 or Windows Server 2008 R2.

Registry information

To apply this update, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

This update does not replace a previously released update.

The global version of this update 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 and notes

  • The files that apply to a specific product, milestone (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 1.18xxx

    Windows 7 or Windows Server 2008 R2

    SP1

    GDR

    6.1.760 1.23 xxx

    Windows 7 or Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very 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 name

File version

File size

Date

Time

Platform

Dwmapi.dll

6.1.7601.18917

67,584

09-Jul-2015

17:42

x86

Dwmcore.dll

6.1.7601.18917

1,372,160

09-Jul-2015

17:42

x86

Dwmapi.dll

6.1.7601.23120

67,584

09-Jul-2015

17:39

x86

Dwmcore.dll

6.1.7601.23120

1,372,160

09-Jul-2015

17:39

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

Dwmapi.dll

6.1.7601.18917

82,944

09-Jul-2015

17:58

x64

Dwmcore.dll

6.1.7601.18917

1,632,256

09-Jul-2015

17:58

x64

Dwmapi.dll

6.1.7601.23120

82,944

09-Jul-2015

18:03

x64

Dwmcore.dll

6.1.7601.23120

1,632,256

09-Jul-2015

18:03

x64

Dwmapi.dll

6.1.7601.18917

67,584

09-Jul-2015

17:42

x86

Dwmcore.dll

6.1.7601.18917

1,372,160

09-Jul-2015

17:42

x86

Dwmapi.dll

6.1.7601.23120

67,584

09-Jul-2015

17:39

x86

Dwmcore.dll

6.1.7601.23120

1,372,160

09-Jul-2015

17:39

x86


For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Dwmapi.dll

6.1.7601.18917

134,144

09-Jul-2015

17:06

IA-64

Dwmcore.dll

6.1.7601.18917

2,907,648

09-Jul-2015

17:06

IA-64

Dwmapi.dll

6.1.7601.23120

134,144

09-Jul-2015

17:06

IA-64

Dwmcore.dll

6.1.7601.23120

2,907,648

09-Jul-2015

17:06

IA-64

Dwmapi.dll

6.1.7601.18917

67,584

09-Jul-2015

17:42

x86

Dwmcore.dll

6.1.7601.18917

1,372,160

09-Jul-2015

17:42

x86

Dwmapi.dll

6.1.7601.23120

67,584

09-Jul-2015

17:39

x86

Dwmcore.dll

6.1.7601.23120

1,372,160

09-Jul-2015

17:39

x86


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 property

Value

File name

X86_6ca6f733581cc788bb39a2a8cdbd170a_31bf3856ad364e35_6.1.7601.18917_none_2941a8837338c8bc.manifest

File version

Not applicable

File size

712

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

X86_b5733a3774810e7362c273544e0c0b77_31bf3856ad364e35_6.1.7601.23120_none_7d13b74b155671a8.manifest

File version

Not applicable

File size

712

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

X86_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.18917_none_e21940269e3cce41.manifest

File version

Not applicable

File size

2,904

Date (UTC)

09-Jul-2015

Time (UTC)

18:14

Platform

Not applicable

File name

X86_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.23120_none_e290e321b7690bdd.manifest

File version

Not applicable

File size

2,904

Date (UTC)

09-Jul-2015

Time (UTC)

18:09

Platform

Not applicable


Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File property

Value

File name

Amd64_14bf3b24bcbf707c23cbf9d2c623472d_31bf3856ad364e35_6.1.7601.18917_none_7de36b46e3f868da.manifest

File version

Not applicable

File size

716

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

Amd64_620566da198b11c5530306d21fd14a17_31bf3856ad364e35_6.1.7601.23120_none_ac4a144a51944aca.manifest

File version

Not applicable

File size

1,072

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

Amd64_6ca6f733581cc788bb39a2a8cdbd170a_31bf3856ad364e35_6.1.7601.18917_none_856044072b9639f2.manifest

File version

Not applicable

File size

714

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

Amd64_aa51ceff801c51e00f3230d4fe02613b_31bf3856ad364e35_6.1.7601.23120_none_8f7aada60cdfecb6.manifest

File version

Not applicable

File size

716

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

Amd64_b5733a3774810e7362c273544e0c0b77_31bf3856ad364e35_6.1.7601.23120_none_d93252cecdb3e2de.manifest

File version

Not applicable

File size

714

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

Amd64_d3088c7acff68e2aec2f0c3ddaf1e5e3_31bf3856ad364e35_6.1.7601.18917_none_c95f67cbf8bb77cd.manifest

File version

Not applicable

File size

1,072

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

Amd64_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.18917_none_3e37dbaa569a3f77.manifest

File version

Not applicable

File size

2,906

Date (UTC)

09-Jul-2015

Time (UTC)

18:31

Platform

Not applicable

File name

Amd64_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.23120_none_3eaf7ea56fc67d13.manifest

File version

Not applicable

File size

2,906

Date (UTC)

09-Jul-2015

Time (UTC)

18:34

Platform

Not applicable

File name

X86_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.18917_none_e21940269e3cce41.manifest

File version

Not applicable

File size

2,904

Date (UTC)

09-Jul-2015

Time (UTC)

18:14

Platform

Not applicable

File name

X86_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.23120_none_e290e321b7690bdd.manifest

File version

Not applicable

File size

2,904

Date (UTC)

09-Jul-2015

Time (UTC)

18:09

Platform

Not applicable


Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File property

Value

File name

Ia64_4c6db2b28c2d25bba6be035616c41d8e_31bf3856ad364e35_6.1.7601.18917_none_e55c79659bcb403b.manifest

File version

Not applicable

File size

1,070

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

Ia64_9f9faf5aca6576247971376f523a52d5_31bf3856ad364e35_6.1.7601.23120_none_23b832549c2f1806.manifest

File version

Not applicable

File size

1,070

Date (UTC)

10-Jul-2015

Time (UTC)

01:26

Platform

Not applicable

File name

Ia64_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.18917_none_e21ae41c9e3ad73d.manifest

File version

Not applicable

File size

2,905

Date (UTC)

09-Jul-2015

Time (UTC)

18:17

Platform

Not applicable

File name

Ia64_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.23120_none_e2928717b76714d9.manifest

File version

Not applicable

File size

2,905

Date (UTC)

09-Jul-2015

Time (UTC)

18:16

Platform

Not applicable

File name

X86_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.18917_none_e21940269e3cce41.manifest

File version

Not applicable

File size

2,904

Date (UTC)

09-Jul-2015

Time (UTC)

18:14

Platform

Not applicable

File name

X86_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7601.23120_none_e290e321b7690bdd.manifest

File version

Not applicable

File size

2,904

Date (UTC)

09-Jul-2015

Time (UTC)

18:09

Platform

Not applicable



Status

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

References

See the terminology that Microsoft uses to describe software updates.

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