Description of Preview of Quality Rollup for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 8.1, Windows 8.1 RT and Server 2012 R2 (KB4486545)

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

The February 2019 update for Windows Server 2012 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 Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 require that update KB 2919355 is installed. We recommend that you install update KB 2919355 on your Windows 8.1-based, Windows RT 8.1-based, or Windows Server 2012 R2-based computer so that you receive updates in the future.
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

Addresses an issue in System.Threading.Timer where a single global queue that was protected by a single process-wide lock causing a issues with scalability where Timers are used frequently on multi-CPU machine. The fix can be opted into with an AppContext switch:

Switch name: Switch.System.Threading.UseNetCoreTimer
Switch value to enable: true

See instructions for enabling the switch here: https://learn.microsoft.com/en-us/dotnet/api/system.appcontext?view=netframework-4.7.2#appcontext-for-library-consumers
Don’t rely on applying the setting programmatically. The switch value is read only once per AppDomain at the time when the System.Threading.Timer type is loaded.

SQL²

Addresses an issue that caused compatibility breaks seen in some System.Data.SqlClient usage scenarios.

WPF³

Improved the memory allocation and cleanup scheduling behavior of the weak-event pattern. To opt-in to these improvements, set AppContext switches to 'true': Switch.MS.Internal.EnableWeakEventMemoryImprovements and Switch.MS.Internal.EnableCleanupSchedulingImprovements.

¹ Common Language Runtime (CLR)
² SQL Server (SQL)
³ Windows Presentation Foundation (WPF)

Additional information about this update

For more information about this update as it relates to Windows Server 2012, see the following article in the Microsoft Knowledge Base:

4487258 February 2019 Preview of the Quality Rollups for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 8.1, Windows 8.1 RT and Server 2012 R2 (KB 4487258)

How to obtain and install the update

Method 1: Microsoft Update Catalog

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

Method 2: 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 4487257 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 replaces previously released update KB 4481489.

File information

Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2

File attributes for all supported x86 based versions of systems

File name	File version	File size	Date	Time	Platform
Mscorlib.dll	4.7.3362.0	5,646,600	04-Jan-2019	23:00	Not applicable
Normidna.nlp	Not applicable	59,342	15-May-2018	18:22	Not applicable
Normnfc.nlp	Not applicable	47,076	15-May-2018	18:22	Not applicable
Normnfd.nlp	Not applicable	40,566	15-May-2018	18:22	Not applicable
Normnfkc.nlp	Not applicable	67,808	15-May-2018	18:22	Not applicable
Normnfkd.nlp	Not applicable	61,718	15-May-2018	18:22	Not applicable
Clrjit.dll	4.7.3362.0	686,040	04-Jan-2019	23:00	Not applicable
Clr.dll	4.7.3362.0	6,752,520	04-Jan-2019	23:00	Not applicable
Mscordacwks.dll	4.7.3362.0	1,296,648	04-Jan-2019	23:00	Not applicable
Mscordbi.dll	4.7.3362.0	1,131,784	04-Jan-2019	23:00	Not applicable
Mscoreei.dll	4.6.1099.0	514,544	27-Mar-2017	03:27	Not applicable
Mscorlib.ni.dll	4.7.3362.0	20,741,760	04-Jan-2019	23:04	Not applicable
Msvcp120_clr0400.dll	12.0.52242.36242	602,080	13-Dec-2018	02:35	Not applicable
Msvcr120_clr0400.dll	12.0.52242.36242	634,336	13-Dec-2018	02:35	Not applicable
Sos.dll	4.7.3362.0	648,664	04-Jan-2019	23:00	Not applicable
System.componentmodel.dataannotations.dll	4.6.1099.0	125,760	27-Mar-2017	03:33	x86
System.core.dll	4.7.3362.0	1,552,208	04-Jan-2019	23:04	x86
System.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33	x86
Wminet_utils.dll	4.7.2102.0	110,592	06-Jun-2017	23:10	Not applicable
Workflowservicehostperformancecounters.dll	4.7.3353.0	72,664	19-Dec-2018	23:10	Not applicable
System.data.dll	4.7.3260.0	3,454,136	05-Oct-2018	21:07	Not applicable
System.transactions.dll	4.7.3221.0	307,328	30-Aug-2018	22:08	Not applicable
System.web.dll	4.7.3282.0	5,417,224	31-Oct-2018	01:30	Not applicable
Smdiagnostics.dll	4.7.3324.0	74,048	07-Dec-2018	21:01	x86
System.activities.dll	4.7.3324.0	1,532,712	07-Dec-2018	21:01	x86
System.componentmodel.dataannotations.dll	4.6.1099.0	125,760	27-Mar-2017	03:33	x86
System.configuration.dll	4.7.3324.0	419,648	07-Dec-2018	21:01	x86
System.core.dll	4.7.3362.0	1,552,208	04-Jan-2019	23:04	x86
System.data.sqlxml.dll	4.7.2612.0	734,400	22-Nov-2017	20:59	x86
System.deployment.dll	4.6.1099.0	846,016	27-Mar-2017	03:33	x86
System.directoryservices.protocols.dll	4.6.1099.0	200,488	27-Mar-2017	03:33	x86
System.drawing.dll	4.6.1099.0	594,616	27-Mar-2017	03:33	x86
System.identitymodel.dll	4.7.3324.0	1,090,368	07-Dec-2018	21:01	x86
System.management.dll	4.7.2102.0	415,432	06-Jun-2017	23:17	x86
System.net.http.dll	4.7.2634.0	203,352	02-Feb-2018	21:11	x86
System.runtime.remoting.dll	4.7.2114.0	347,368	30-Aug-2017	06:04	x86
System.runtime.serialization.dll	4.7.3324.0	1,056,552	07-Dec-2018	21:01	x86
System.security.dll	4.7.2650.0	324,696	21-Mar-2018	04:49	x86
System.servicemodel.internals.dll	4.7.3324.0	260,928	07-Dec-2018	21:01	x86
System.servicemodel.dll	4.7.3324.0	6,322,496	07-Dec-2018	21:01	x86
System.web.applicationservices.dll	4.7.3282.0	71,120	31-Oct-2018	01:33	x86
System.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33	x86
System.windows.forms.dll	4.7.3324.0	5,236,640	07-Dec-2018	21:01	x86
System.xaml.dll	4.7.3362.0	642,176	04-Jan-2019	23:04	x86
System.xml.dll	4.7.2612.0	2,670,224	22-Nov-2017	20:59	x86
System.dll	4.7.3362.0	3,559,552	04-Jan-2019	23:04	x86

File attributes for all supported x64 based versions of systems

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Presentationframework-systemdata.dll	4.7.3362.0	24,320	04-Jan-2019	23:04	x86	None	Not applicable
Presentationframework.dll	4.7.3362.0	6,237,240	04-Jan-2019	23:04	x86	None	Not applicable
Smdiagnostics.dll	4.7.3324.0	74,048	07-Dec-2018	21:00	x86	None	Not applicable
System.activities.dll	4.7.3324.0	1,532,712	07-Dec-2018	21:00	x86	None	Not applicable
System.componentmodel.dataannotations.dll	4.6.1099.0	125,760	27-Mar-2017	03:33	x86	None	Not applicable
System.configuration.dll	4.7.3324.0	419,648	07-Dec-2018	21:00	x86	None	Not applicable
System.core.dll	4.7.3362.0	1,552,208	04-Jan-2019	23:04	x86	None	Not applicable
System.data.entity.dll	4.7.2102.0	4,033,744	06-Jun-2017	23:17	x86	None	Not applicable
System.data.sqlxml.dll	4.7.2612.0	734,400	22-Nov-2017	20:59	x86	None	Not applicable
System.deployment.dll	4.6.1099.0	846,016	27-Mar-2017	03:33	x86	None	Not applicable
System.directoryservices.accountmanagement.dll	4.7.2623.0	296,216	30-Nov-2017	04:16	x86	None	Not applicable
System.directoryservices.protocols.dll	4.6.1099.0	200,488	27-Mar-2017	03:33	x86	None	Not applicable
System.drawing.dll	4.6.1099.0	594,616	27-Mar-2017	03:33	x86	None	Not applicable
System.identitymodel.services.dll	4.7.3324.0	198,400	07-Dec-2018	21:00	x86	None	Not applicable
System.identitymodel.dll	4.7.3324.0	1,090,368	07-Dec-2018	21:00	x86	None	Not applicable
System.management.dll	4.7.2102.0	415,432	06-Jun-2017	23:17	x86	None	Not applicable
System.net.http.dll	4.7.2634.0	203,352	02-Feb-2018	21:11	x86	None	Not applicable
System.runtime.caching.dll	4.6.1649.1	108,920	21-Apr-2017	05:35	x86	None	Not applicable
System.runtime.remoting.dll	4.7.2114.0	347,368	30-Aug-2017	06:04	x86	None	Not applicable
System.runtime.serialization.dll	4.7.3324.0	1,056,552	07-Dec-2018	21:00	x86	None	Not applicable
System.security.dll	4.7.2650.0	324,696	21-Mar-2018	04:49	x86	None	Not applicable
System.servicemodel.channels.dll	4.7.3324.0	157,952	07-Dec-2018	21:00	x86	None	Not applicable
System.servicemodel.discovery.dll	4.7.3324.0	308,464	07-Dec-2018	21:00	x86	None	Not applicable
System.servicemodel.internals.dll	4.7.3324.0	260,928	07-Dec-2018	21:00	x86	None	Not applicable
System.servicemodel.routing.dll	4.6.1099.0	130,288	27-Mar-2017	03:33	x86	None	Not applicable
System.servicemodel.washosting.dll	4.7.3324.0	40,192	07-Dec-2018	21:00	x86	None	Not applicable
System.servicemodel.dll	4.7.3324.0	6,322,496	07-Dec-2018	21:00	x86	None	Not applicable
System.web.applicationservices.dll	4.7.3282.0	71,120	31-Oct-2018	01:33	x86	None	Not applicable
System.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33	x86	None	Not applicable
System.windows.controls.ribbon.dll	4.7.3362.0	742,456	04-Jan-2019	23:04	x86	None	Not applicable
System.windows.forms.dll	4.7.3324.0	5,236,640	07-Dec-2018	21:00	x86	None	Not applicable
System.workflow.activities.dll	4.7.3353.0	1,051,192	19-Dec-2018	23:13	x86	None	Not applicable
System.workflow.componentmodel.dll	4.7.3353.0	1,549,880	19-Dec-2018	23:13	x86	None	Not applicable
System.workflow.runtime.dll	4.7.3353.0	498,936	19-Dec-2018	23:13	x86	None	Not applicable
System.xaml.dll	4.7.3362.0	642,176	04-Jan-2019	23:04	x86	None	Not applicable
System.xml.dll	4.7.2612.0	2,670,224	22-Nov-2017	20:59	x86	None	Not applicable
System.dll	4.7.3362.0	3,559,552	04-Jan-2019	23:04	x86	None	Not applicable
Uiautomationclientsideproviders.dll	4.7.3362.0	361,016	04-Jan-2019	23:04	x86	None	Not applicable
Uiautomationclient.dll	4.7.3362.0	177,720	04-Jan-2019	23:04	x86	None	Not applicable
Uiautomationprovider.dll	4.7.3362.0	48,904	04-Jan-2019	23:04	x86	None	Not applicable
Uiautomationtypes.dll	4.7.3362.0	220,936	04-Jan-2019	23:04	x86	None	Not applicable
Windowsbase.dll	4.7.3362.0	1,296,136	04-Jan-2019	23:04	x86	None	Not applicable
Mscorlib.dll	4.7.3362.0	5,645,368	04-Jan-2019	23:04	x86	None	Not applicable
Normidna.nlp	Not applicable	59,342	15-May-2018	18:22	Not applicable	None	Not applicable
Normnfc.nlp	Not applicable	47,076	15-May-2018	18:22	Not applicable	None	Not applicable
Normnfd.nlp	Not applicable	40,566	15-May-2018	18:22	Not applicable	None	Not applicable
Normnfkc.nlp	Not applicable	67,808	15-May-2018	18:22	Not applicable	None	Not applicable
Normnfkd.nlp	Not applicable	61,718	15-May-2018	18:22	Not applicable	None	Not applicable
Aspnet_perf.dll	4.7.3282.0	42,792	31-Oct-2018	01:33	x86	SPN	X86_NETFX4-ASP
Aspnet_state_perf.h	Not applicable	318	30-Oct-2018	23:38	Not applicable	SPN	X86_NETFX4-ASP
Aspnet_state_perf.ini	Not applicable	42,996	31-Oct-2018	01:34	Not applicable	SPN	X86_NETFX4-ASP
Aspnet_wp.exe	4.7.3282.0	46,088	31-Oct-2018	01:33	x86	SPN	X86_NETFX4-ASP
Clrjit.dll	4.7.3362.0	522,808	04-Jan-2019	23:04	x86	None	Not applicable
Clr.dll	4.7.3362.0	7,249,672	04-Jan-2019	23:04	x86	None	Not applicable
Dfdll.dll	4.6.1099.0	154,768	27-Mar-2017	03:33	x86	None	Not applicable
Globalmonospace.compositefont	Not applicable	26,040	30-Oct-2018	22:50	Not applicable	SPA	X86_NETFX4-GLOBALMONOSP
Globalsansserif.compositefont	Not applicable	26,489	30-Oct-2018	22:50	Not applicable	None	Not applicable
Globalserif.compositefont	Not applicable	29,779	30-Oct-2018	22:50	Not applicable	None	Not applicable
Globaluserinterface.compositefont	Not applicable	186,009	21-Dec-2018	04:47	Not applicable	None	Not applicable
Mscordacwks.dll	4.7.3362.0	1,343,032	04-Jan-2019	23:04	x86	None	Not applicable
Mscordbi.dll	4.7.3362.0	1,168,952	04-Jan-2019	23:04	x86	None	Not applicable
Mscoreei.dll	4.6.1099.0	497,824	27-Mar-2017	03:33	x86	None	Not applicable
Mscorlib.ni.dll	4.7.3362.0	20,551,080	04-Jan-2019	23:04	x86	None	Not applicable
Msvcp120_clr0400.dll	12.0.52519.0	485,576	13-Dec-2018	02:35	x86	None	Not applicable
Msvcr120_clr0400.dll	12.0.52519.0	987,840	13-Dec-2018	02:35	x86	None	Not applicable
Penimc.dll	14.7.3362.0	19,000	04-Jan-2019	23:04	x86	None	Not applicable
Penimc2_v0400.dll	4.7.3362.0	86,280	04-Jan-2019	23:04	x86	None	Not applicable
Penimc_v0400.dll	4.7.3362.0	24,632	04-Jan-2019	23:04	x86	None	Not applicable
Peverify.dll	4.7.3362.0	188,472	04-Jan-2019	23:04	x86	None	Not applicable
Presentationhost_v0400.dll.mui	4.7.3362.0	84,536	04-Jan-2019	23:04	Not applicable	None	Not applicable
Presentationhost_v0400.dll	4.7.3362.0	214,280	04-Jan-2019	23:04	x86	None	Not applicable
Presentationnative_v0400.dll	4.7.3362.0	826,936	04-Jan-2019	23:04	x86	None	Not applicable
Servicemodel.mof	Not applicable	88,383	30-Oct-2018	22:26	Not applicable	None	Not applicable
Servicemodel.mof.uninstall	Not applicable	896	30-Oct-2018	22:26	Not applicable	None	Not applicable
Servicemonikersupport.dll	4.7.3324.0	29,440	07-Dec-2018	21:00	x86	None	Not applicable
Sos.dll	4.7.3362.0	743,688	04-Jan-2019	23:04	x86	None	Not applicable
System.componentmodel.dataannotations.dll	4.6.1099.0	125,760	27-Mar-2017	03:33	x86	None	Not applicable
System.core.dll	4.7.3362.0	1,552,208	04-Jan-2019	23:04	x86	None	Not applicable
System.data.entity.dll	4.7.2102.0	4,033,744	06-Jun-2017	23:17	x86	None	Not applicable
System.web.extensions.dll	4.7.3282.0	1,850,264	31-Oct-2018	01:33	x86	None	Not applicable
Webengine4.dll	4.7.3282.0	550,152	31-Oct-2018	01:33	x86	None	Not applicable
Webengine.dll	4.7.3282.0	24,840	31-Oct-2018	01:33	x86	None	Not applicable
Wminet_utils.dll	4.7.2102.0	136,368	06-Jun-2017	23:17	x86	None	Not applicable
Workflowservicehostperformancecounters.dll	4.7.3353.0	89,352	19-Dec-2018	23:13	x86	None	Not applicable
Wpfgfx_v0400.dll	4.7.3362.0	1,345,080	04-Jan-2019	23:04	x86	None	Not applicable
Presentationcore.dll	4.7.3362.0	3,636,280	04-Jan-2019	23:04	x86	None	Not applicable
System.data.dll	4.7.3260.0	3,462,912	05-Oct-2018	21:12	x86	None	Not applicable
System.transactions.dll	4.7.3221.0	309,328	30-Aug-2018	22:13	x86	None	Not applicable
System.web.dll	4.7.3282.0	5,416,232	31-Oct-2018	01:33	x86	None	Not applicable

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