Description of the update for the .NET Framework 4.6 and 4.6.1 on Window 8.1 and Windows Server 2012 R2: March 21, 2017

Applies to: .NET Framework 4.6.1.NET Framework 4.6


This update for the .NET Framework 4.6 and 4.6.1 on Window 8.1 and Windows Server 2012 R2 includes cumulative improvements in reliability in the .NET Framework 4.6 and 4.6.1. We recommend that you apply this quality rollup as part of your regular maintenance routines. Before you install this update, see the "Prerequisites" and "Restart requirement" sections.

Quality and reliability improvements

  • Windows Presentation Foundation (WPF)

    Customers loading WPF applications that target SxS versions of the .NET Framework in a single process may experience crashes or unexpected behavior on stylus or touch enabled devices. This is sometimes seen when the Visual Studio Tools for Office add-in that is loaded is written in WPF.This error occurs because of a conflict between different versions of PenIMC.dll. This update addresses and fixes this issue.

    Note This update also contains cumulative updates that were released previously starting from October 11, 2016.

More information

How to get this update

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


To apply this update, you must have the .NET Framework 4.6 or 4.6.1 installed, as appropriate.

Restart requirement

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

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.



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


Learn about the terminology Microsoft uses for software updates.

Applies to

This article applies to the following:

  • Microsoft .NET Framework 4.6 and 4.6.1 when used with:
    • Windows Server 2012 R2
    • Window 8.1