Description of the update for .NET Native in Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2

Applies to: Windows 8.1Windows Server 2012 R2Windows RT 8.1

This update applies to Microsoft .NET Native when they are used together with Windows 8.1, Windows Server 2012 R2, or Windows RT 8.1.


Error reports that are sent for .NET Native applications may restrict the investigation of the root causes of errors. The performance of .NET Native applications may be slightly (by a few percentage points) lower than ideal.

This issue occurs in Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2.


This issue occurs because some information may not be included in error reports that are sent by Windows Error Reporting (WER) that can limit analysis capabilities of such reports that are sent for .NET Native applications.

.NET Native applications that run on x64 and x86 systems will rely only on an app-local runtime without any system services that may result in less than optimal performance of .NET Native applications.


This update contains the necessary services to allow capturing of error reports that contain relevant root-cause analysis data. This update also improves the performance of .NET Native applications.

Windows Update

This update is available from Windows Update.

Download information

The following file is available for download from the Microsoft Download Center:
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
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Command-line switches for this update

For more information about the various command-line switches that are supported by this update, go to the "Command-Line options" section of the following MSDN website:

Restart requirement

You may have to restart the computer after you install this software if any affected files are being used. We recommend that you close all applications that are using the .NET Framework before you apply this update.

Update replacement information

This update does not replace any previously released update.

Update removal information

To remove this update, use the Programs and Features item in Control Panel.


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