View products that this article applies to.

Introduction

This August 2017 Update for Windows 7 Service Pack 1 (SP1) and Windows Server 2008 R2 SP1 includes cumulative reliability improvements in the .NET Framework 3.5.1. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the "Prerequisites" and "Restart requirement" sections.

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.

Quality and reliability improvements

CLR

  • Very rarely, an instance of ReaderWriterLock may crash when releasing a lock. A new configuration variable is introduced to enable opting in to the fix. Set the environment variable COMPlus_ReaderWriterLock_UseFixedIdGeneration to 1 when you start the application to fix the issue.

WMI

  • Code was changed to make the setting of the permissions event-driven so that it could support changes in the option values.

Additional information about this update

For more information about this update as it relates to Windows 7 SP1 and Windows Server 2008 R2 SP1, see the following article in the Microsoft Knowledge Base:

4035036 August 2017 Preview of the Quality Rollups for the .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 for Windows 7 SP1 and Windows Server 2008 R2 SP1: August 15, 2017

How to get this update

Windows Update

This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Windows Software Update Services (WSUS)

On your WSUS server, follow these steps:

  1. Click Start, click Administrative Tools, and then click Microsoft Windows Server Update Services 3.0.

  2. Expand ComputerName, and then click Action.

  3. Click Import Updates.

  4. WSUS will open a browser window in which you may be prompted to install an ActiveX control. Install the ActiveX control to continue.

  5. Once the ActiveX control is installed, you will see the Microsoft Update Catalog screen. Type 4035036 in the Search box, and then click Search.

  6. Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Click Add to add them to your basket.

  7. When you have selected all the packages you need, click View Basket.

  8. Click Import to import the packages to your WSUS server.

  9. Click Close once the packages have been imported to return to WSUS.

The updates are now available for installation through WSUS.

Prerequisites

To apply this update, you must have the .NET Framework 3.5.1 installed.

Restart requirement

You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

Update replacement information

This update replaces previously released update 4014596 that is dated May 16, 2017.

File information

The English (United States) version of this update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and 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 times may change when you perform certain operations on the files.

For all supported x86-based versions of systems

File name

File version

File size

Date

Time

presentationframework.dll

3.0.6920.8773

5,283,840

29-Mar-2017

13:05

reachframework.dll

3.0.6920.8773

532,480

29-Mar-2017

13:05

system.management.dll

2.0.50727.8766

389,120

11-Jul-2017

20:05

system.security.dll

2.0.50727.8759

270,336

28-Mar-2017

13:05

system.web.regularexpressions.dll

2.0.50727.8762

98,304

07-Apr-2017

13:05

system.dll

2.0.50727.8759

3,203,072

28-Mar-2017

13:05

windowsbase.dll

3.0.6920.8773

1,257,472

29-Mar-2017

13:05

big5.nlp

66,728

23-Mar-2016

22:39

bopomofo.nlp

82,172

23-Mar-2016

22:39

ksc.nlp

116,756

23-Mar-2016

22:39

mscorlib.dll

2.0.50727.8762

4,554,752

07-Apr-2017

13:05

normidna.nlp

59,342

23-Mar-2016

22:39

normnfc.nlp

45,794

23-Mar-2016

22:39

normnfd.nlp

39,284

23-Mar-2016

22:39

normnfkc.nlp

66,384

23-Mar-2016

22:39

normnfkd.nlp

60,294

23-Mar-2016

22:39

prc.nlp

83,748

23-Mar-2016

22:39

prcp.nlp

83,748

23-Mar-2016

22:39

sortkey.nlp

262,148

23-Mar-2016

22:39

sorttbls.nlp

20,320

23-Mar-2016

22:39

xjis.nlp

28,288

23-Mar-2016

22:39

aspnet_wp.exe

2.0.50727.8762

31,384

07-Apr-2017

13:05

mscordacwks.dll

2.0.50727.8762

990,368

07-Apr-2017

13:05

mscorwks.dll

2.0.50727.8762

5,946,520

07-Apr-2017

13:05

sos.dll

2.0.50727.8762

389,776

07-Apr-2017

13:05

webengine.dll

2.0.50727.8762

437,400

07-Apr-2017

13:05

wminet_utils.dll

2.0.50727.8766

116,896

11-Jul-2017

20:05

presentationcore.dll

3.0.6920.8773

4,222,976

29-Mar-2017

13:05

presentationfontcache.exe.config

161

23-Mar-2016

22:38

wpfgfx_v0300.dll

3.0.6920.8773

1,737,888

29-Mar-2017

13:05

system.data.dll

2.0.50727.8762

2,975,744

06-Apr-2017

13:05

system.printing.dll

3.0.6920.8773

372,736

29-Mar-2017

13:05

system.web.dll

2.0.50727.8762

5,287,936

07-Apr-2017

13:05

penimc.dll

3.0.6920.8773

68,752

29-Mar-2017

13:05

presentationframework.dll

3.0.6920.8773

5,283,840

29-Mar-2017

13:05

presentationhostdll.dll

3.0.6920.8773

131,248

29-Mar-2017

13:05

reachframework.dll

3.0.6920.8773

532,480

29-Mar-2017

13:05

windowsbase.dll

3.0.6920.8773

1,257,472

29-Mar-2017

13:05

For all supported x64-based versions of systems

File name

File version

File size

Date

Time

big5.nlp

66,728

23-Mar-2016

22:39

bopomofo.nlp

82,172

23-Mar-2016

22:39

ksc.nlp

116,756

23-Mar-2016

22:39

mscorlib.dll

2.0.50727.8762

4,571,136

07-Apr-2017

13:05

normidna.nlp

59,342

23-Mar-2016

22:40

normnfc.nlp

45,794

23-Mar-2016

22:40

normnfd.nlp

39,284

23-Mar-2016

22:40

normnfkc.nlp

66,384

23-Mar-2016

22:40

normnfkd.nlp

60,294

23-Mar-2016

22:40

prc.nlp

83,748

23-Mar-2016

22:40

prcp.nlp

83,748

23-Mar-2016

22:40

sortkey.nlp

262,148

23-Mar-2016

22:40

sorttbls.nlp

20,320

23-Mar-2016

22:40

xjis.nlp

28,288

23-Mar-2016

22:40

aspnet_wp.exe

2.0.50727.8762

43,160

07-Apr-2017

13:05

mscordacwks.dll

2.0.50727.8762

1,757,344

07-Apr-2017

13:05

mscorwks.dll

2.0.50727.8762

10,007,704

07-Apr-2017

13:05

sos.dll

2.0.50727.8762

486,032

07-Apr-2017

13:05

system.management.dll

2.0.50727.8766

389,120

11-Jul-2017

20:05

system.security.dll

2.0.50727.8759

270,336

28-Mar-2017

13:05

system.web.regularexpressions.dll

2.0.50727.8762

98,304

07-Apr-2017

13:05

system.dll

2.0.50727.8759

3,203,072

28-Mar-2017

13:05

webengine.dll

2.0.50727.8762

746,648

07-Apr-2017

13:05

wminet_utils.dll

2.0.50727.8766

140,960

11-Jul-2017

20:05

presentationcore.dll

3.0.6920.8773

4,006,400

29-Mar-2017

13:05

presentationfontcache.exe.config

161

23-Mar-2016

22:39

wpfgfx_v0300.dll

3.0.6920.8773

2,256,032

29-Mar-2017

13:05

system.data.dll

2.0.50727.8762

3,150,336

06-Apr-2017

13:05

system.printing.dll

3.0.6920.8773

358,400

29-Mar-2017

13:05

system.web.dll

2.0.50727.8762

5,296,128

07-Apr-2017

13:05

penimc.dll

3.0.6920.8773

85,648

29-Mar-2017

13:05

presentationframework.dll

3.0.6920.8773

4,640,768

29-Mar-2017

13:05

presentationhostdll.dll

3.0.6920.8773

172,208

29-Mar-2017

13:05

reachframework.dll

3.0.6920.8773

532,480

29-Mar-2017

13:05

windowsbase.dll

3.0.6920.8773

1,118,208

29-Mar-2017

13:05

presentationframework.dll

3.0.6920.8773

5,283,840

29-Mar-2017

13:05

reachframework.dll

3.0.6920.8773

532,480

29-Mar-2017

13:05

system.management.dll

2.0.50727.8766

389,120

11-Jul-2017

20:05

system.security.dll

2.0.50727.8759

270,336

28-Mar-2017

13:05

system.web.regularexpressions.dll

2.0.50727.8762

98,304

07-Apr-2017

13:05

system.dll

2.0.50727.8759

3,203,072

28-Mar-2017

13:05

windowsbase.dll

3.0.6920.8773

1,257,472

29-Mar-2017

13:05

big5.nlp

66,728

23-Mar-2016

22:39

bopomofo.nlp

82,172

23-Mar-2016

22:39

ksc.nlp

116,756

23-Mar-2016

22:39

mscorlib.dll

2.0.50727.8762

4,554,752

07-Apr-2017

13:05

normidna.nlp

59,342

23-Mar-2016

22:39

normnfc.nlp

45,794

23-Mar-2016

22:39

normnfd.nlp

39,284

23-Mar-2016

22:39

normnfkc.nlp

66,384

23-Mar-2016

22:39

normnfkd.nlp

60,294

23-Mar-2016

22:39

prc.nlp

83,748

23-Mar-2016

22:39

prcp.nlp

83,748

23-Mar-2016

22:39

sortkey.nlp

262,148

23-Mar-2016

22:39

sorttbls.nlp

20,320

23-Mar-2016

22:39

xjis.nlp

28,288

23-Mar-2016

22:39

aspnet_wp.exe

2.0.50727.8762

31,384

07-Apr-2017

13:05

mscordacwks.dll

2.0.50727.8762

990,368

07-Apr-2017

13:05

mscorwks.dll

2.0.50727.8762

5,946,520

07-Apr-2017

13:05

sos.dll

2.0.50727.8762

389,776

07-Apr-2017

13:05

webengine.dll

2.0.50727.8762

437,400

07-Apr-2017

13:05

wminet_utils.dll

2.0.50727.8766

116,896

11-Jul-2017

20:05

presentationcore.dll

3.0.6920.8773

4,222,976

29-Mar-2017

13:05

presentationfontcache.exe.config

161

23-Mar-2016

22:38

wpfgfx_v0300.dll

3.0.6920.8773

1,737,888

29-Mar-2017

13:05

system.data.dll

2.0.50727.8762

2,975,744

06-Apr-2017

13:05

system.printing.dll

3.0.6920.8773

372,736

29-Mar-2017

13:05

system.web.dll

2.0.50727.8762

5,287,936

07-Apr-2017

13:05

penimc.dll

3.0.6920.8773

68,752

29-Mar-2017

13:05

presentationframework.dll

3.0.6920.8773

5,283,840

29-Mar-2017

13:05

presentationhostdll.dll

3.0.6920.8773

131,248

29-Mar-2017

13:05

reachframework.dll

3.0.6920.8773

532,480

29-Mar-2017

13:05

windowsbase.dll

3.0.6920.8773

1,257,472

29-Mar-2017

13:05

For all supported IA64-based versions of systems

File name

File version

File size

Date

Time

big5.nlp

66,728

23-Mar-2016

22:40

bopomofo.nlp

82,172

23-Mar-2016

22:40

ksc.nlp

116,756

23-Mar-2016

22:41

mscorlib.dll

2.0.50727.8762

4,014,080

07-Apr-2017

13:05

normidna.nlp

59,342

23-Mar-2016

22:41

normnfc.nlp

45,794

23-Mar-2016

22:41

normnfd.nlp

39,284

23-Mar-2016

22:41

normnfkc.nlp

66,384

23-Mar-2016

22:41

normnfkd.nlp

60,294

23-Mar-2016

22:41

prc.nlp

83,748

23-Mar-2016

22:41

prcp.nlp

83,748

23-Mar-2016

22:41

sortkey.nlp

262,148

23-Mar-2016

22:41

sorttbls.nlp

20,320

23-Mar-2016

22:41

xjis.nlp

28,288

23-Mar-2016

22:41

aspnet_wp.exe

2.0.50727.8762

83,096

07-Apr-2017

13:05

mscordacwks.dll

2.0.50727.8762

3,083,424

07-Apr-2017

13:05

mscorwks.dll

2.0.50727.8762

20,404,376

07-Apr-2017

13:05

sos.dll

2.0.50727.8762

873,616

07-Apr-2017

13:05

system.management.dll

2.0.50727.8766

389,120

11-Jul-2017

20:05

system.security.dll

2.0.50727.8759

270,336

28-Mar-2017

13:06

system.web.regularexpressions.dll

2.0.50727.8762

98,304

07-Apr-2017

13:05

system.dll

2.0.50727.8759

3,203,072

28-Mar-2017

13:06

webengine.dll

2.0.50727.8762

1,233,560

07-Apr-2017

13:05

wminet_utils.dll

2.0.50727.8766

290,976

11-Jul-2017

20:05

system.data.dll

2.0.50727.8762

3,310,592

06-Apr-2017

13:05

system.web.dll

2.0.50727.8762

4,816,896

07-Apr-2017

13:05

system.management.dll

2.0.50727.8766

389,120

11-Jul-2017

20:05

system.security.dll

2.0.50727.8759

270,336

28-Mar-2017

13:05

system.web.regularexpressions.dll

2.0.50727.8762

98,304

07-Apr-2017

13:05

system.dll

2.0.50727.8759

3,203,072

28-Mar-2017

13:05

big5.nlp

66,728

23-Mar-2016

22:39

bopomofo.nlp

82,172

23-Mar-2016

22:39

ksc.nlp

116,756

23-Mar-2016

22:39

mscorlib.dll

2.0.50727.8762

4,554,752

07-Apr-2017

13:05

normidna.nlp

59,342

23-Mar-2016

22:39

normnfc.nlp

45,794

23-Mar-2016

22:39

normnfd.nlp

39,284

23-Mar-2016

22:39

normnfkc.nlp

66,384

23-Mar-2016

22:39

normnfkd.nlp

60,294

23-Mar-2016

22:39

prc.nlp

83,748

23-Mar-2016

22:39

prcp.nlp

83,748

23-Mar-2016

22:39

sortkey.nlp

262,148

23-Mar-2016

22:39

sorttbls.nlp

20,320

23-Mar-2016

22:39

xjis.nlp

28,288

23-Mar-2016

22:39

aspnet_wp.exe

2.0.50727.8762

31,384

07-Apr-2017

13:05

mscordacwks.dll

2.0.50727.8762

990,368

07-Apr-2017

13:05

mscorwks.dll

2.0.50727.8762

5,946,520

07-Apr-2017

13:05

sos.dll

2.0.50727.8762

389,776

07-Apr-2017

13:05

webengine.dll

2.0.50727.8762

437,400

07-Apr-2017

13:05

wminet_utils.dll

2.0.50727.8766

116,896

11-Jul-2017

20:05

system.data.dll

2.0.50727.8762

2,975,744

06-Apr-2017

13:05

system.web.dll

2.0.50727.8762

5,287,936

07-Apr-2017

13:05

 

Applies to

This article applies to the following:

 

  • Microsoft .NET Framework 3.5.1 when used with:

    • Windows Server 2008 R2 Service Pack 1

    • Windows 7 Service Pack 1

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×