Description of the Update for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 7 SP1 and Server 2008 R2 SP1 and 4.6 for Windows Server 2008 SP2 (KB 4488666)

Applies to:

Microsoft .NET Framework 4.6, Microsoft .NET Framework 4.6.1, Microsoft .NET Framework 4.6.2, Microsoft .NET Framework 4.7, Microsoft .NET Framework 4.7.1, Microsoft .NET Framework 4.7.2

This update for Windows 7 Service Pack 1 (SP1), Server 2008 R2 Service Pack 1 (SP1), and Server 2008 Service Pack 2 (SP2) includes cumulative reliability improvements in .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2. 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

All updates for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 require that the d3dcompiler_47.dll update is installed. We recommend that you install the included d3dcompiler_47.dll update before you apply this update. For more information about the d3dcompiler_47.dll update, see KB 4019990 for Windows 7 SP1 and Windows Server 2008 R2 SP1. Or, see KB 4019478 for Windows Server 2008 SP2.
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

CLR¹

Addressed an issue where the Framework would throw an exception is the year in the parsed date is greater or equal the year start the next era. Now, the framework will not throw such exception.
Updated Japanese Era dates that are formatted for the first year in an era and for which the format pattern uses “y年”. The format of the year together with the symbol “元” is supported instead of using year number 1. Also, formatting day numbers that include “元” is supported.
Removed dependency of single quote to output the Gannen character in Japanese Era formatting.

¹ Common Language Runtime (CLR)

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:

4489486 March 2019 Update for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 7 SP1 and Server 2008 R2 SP1 (KB 4489486)

For more information about this update as it relates to Windows Server 2008 SP2, see the following article in the Microsoft Knowledge Base:

4489489 March 2019 Update for .NET Framework 2.0 SP2, 3.0 SP2, 4.5.2, and 4.6 for Windows Server 2008 SP2 (KB 4489489)

Known Issues

Microsoft is not currently aware of any issues with this update.

How to obtain and install the update

Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog.

Windows Software Update Services (WSUS)

On your WSUS server, follow these steps:

Select Start, select Administrative Tools, and then select Microsoft Windows Server Update Services 3.0.
Expand ComputerName, and then select Action.
Select Import Updates.
WSUS opens a browser window in which you may be prompted to install an ActiveX control. You must install the ActiveX control to continue.
After the ActiveX control is installed, you see the Microsoft Update Catalog screen. Type 4489486 for Windows 7 SP1 and Windows Server 2008 R2 SP1 or type 4489489 for Windows Server 2008 SP2 in the Search box, and then select Search
Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Select Add to add them to your basket.
After you select all the packages that you require, select View Basket.
To import the packages to your WSUS server, select Import.
After the packages are imported, select Close to return to WSUS.

The updates are now available for installation through WSUS.

Prerequisites

To apply this update, you must have .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, or 4.7.2 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 does not replace a previously released update.

File information

The English (United States) version of this software 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 Server 2012

Note: The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed 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.

x86 Windows 7 SP1 and Server 2008 SP2

File name	File version	File size	Date	Time
clr.dll	4.7.3394.0	7,249,664	05-Feb-2019	21:07
clrjit.dll	4.7.3394.0	523,008	05-Feb-2019	21:07
mscordacwks.dll	4.7.3394.0	1,343,024	05-Feb-2019	21:07
mscordbi.dll	4.7.3394.0	1,168,944	05-Feb-2019	21:07
mscorlib.dll	4.7.3394.0	5,645,360	05-Feb-2019	21:07
msvcp120_clr0400.dll	12.0.52519.0	485,576	05-Feb-2019	21:08
msvcr120_clr0400.dll	12.0.52519.0	987,840	05-Feb-2019	21:08
peverify.dll	4.7.3394.0	188,464	05-Feb-2019	21:08
SOS.dll	4.7.3394.0	743,472	05-Feb-2019	21:07

x64 Windows 7 SP1, Server 2008 R2 SP1 and Server 2008 SP2

File name	File version	File size	Date	Time
clr.dll	4.7.3394.0	10,377,992	05-Feb-2019	21:19
clr.dll	4.7.3394.0	7,249,664	05-Feb-2019	21:07
clrjit.dll	4.7.3394.0	1,221,680	05-Feb-2019	21:19
clrjit.dll	4.7.3394.0	523,008	05-Feb-2019	21:07
compatjit.dll	4.7.3394.0	1,259,776	05-Feb-2019	21:19
mscordacwks.dll	4.7.3394.0	1,840,384	05-Feb-2019	21:19
mscordacwks.dll	4.7.3394.0	1,343,024	05-Feb-2019	21:07
mscordbi.dll	4.7.3394.0	1,622,064	05-Feb-2019	21:19
mscordbi.dll	4.7.3394.0	1,168,944	05-Feb-2019	21:07
mscorlib.dll	4.7.3394.0	5,427,248	05-Feb-2019	21:19
mscorlib.dll	4.7.3394.0	5,645,360	05-Feb-2019	21:07
msvcp120_clr0400.dll	12.0.52519.0	690,008	05-Feb-2019	21:19
msvcp120_clr0400.dll	12.0.52519.0	485,576	05-Feb-2019	21:08
msvcr120_clr0400.dll	12.0.52519.0	993,632	05-Feb-2019	21:19
msvcr120_clr0400.dll	12.0.52519.0	987,840	05-Feb-2019	21:08
peverify.dll	4.7.3394.0	260,144	05-Feb-2019	21:19
peverify.dll	4.7.3394.0	188,464	05-Feb-2019	21:08
SOS.dll	4.7.3394.0	871,984	05-Feb-2019	21:19
SOS.dll	4.7.3394.0	743,472	05-Feb-2019	21:07

How to obtain help and support for this update

Help for installing updates: Windows Update FAQ
Protect yourself online and at home: Windows Security support
Local support according to your country: International Support