This article describes an update that enables a security feature in Windows 8.1 or Windows Server 2012 R2. Before you install this update, check out the Prerequisites section.

About this update

This is a follow-up update to November 2014 update (3000850) to improve hardening for Rgb9rast.dll binary. The update 3000850 introduced defense-in-depth changes to harden security.  

How to obtain this update

Important Do not install a language pack after you install this update. If you do, the language-specific changes in the update will not be applied, and you will have to reinstall the update. For more information, see Add language packs to Windows.

Method 1: Windows Update

This update is provided as an Optional update from Windows Update.

To obtain this update from Windows Update, follow these steps:

  1. Swipe in from the right edge of the screen, and then tap Search. Or, if you are using a mouse, point to the lower-right corner of the screen, and then click Search.

  2. In the search box, type Windows Update, and then tap or click Windows Update.

  3. In the left pane, click Check for updates, and then wait while Windows looks for the latest updates for your computer.

  4. If you see a message telling you that optional updates are available, or telling you to review optional updates, click the message to view the optional updates.

  5. In the list, select the check box for update 3055323 under Optional, and then tap or click Install.

See the frequently asked questions for Windows Update in Windows 8.1.


Method 2: Microsoft Download CenterThe following files are available for download from the Microsoft Download Center:

Operating system

Update

All supported x86-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows 8.1

Download Download the package now.

All supported x64-based versions of Windows Server 2012 R2

Download Download the package now.

Note The update for Windows RT 8.1 can be obtained only from Windows Update.



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 Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Update detail information

PrerequisitesTo install this update, you must have April 2014, update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in Windows 8.1 or Windows Server 2012 R2.

Registry informationTo apply this update, you do not have to make any changes to the registry.

Restart requirementYou may have to restart the computer after you apply this update.

Update replacement informationThis update does not replace a previously released update.

The global version of this 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 8.1 and Windows Server 2012 R2 file information and notes


  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.3.960 0.17 xxx

    Windows 8.1 and Windows Server 2012 R2

    RTM

    GDR

    6.3.960 0.16 xxx

    Windows 8.1 and Windows Server 2012 R2

    RTM

    GDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

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

For all supported x86-based versions of Windows 8.1

File name

File version

File size

Date

Time

Platform

Rgb9rast.dll

6.3.9600.17794

158,720

08-Apr-2015

22:41

x86

For all supported x64-based versions of Windows 8.1 or Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Rgb9rast.dll

6.3.9600.17415

189,440

29-Oct-2014

02:34

x64

Rgb9rast.dll

6.3.9600.17794

158,720

08-Apr-2015

22:41

x86


Additional file information


Additional file information for Windows 8.1 and for Windows Server 2012 R2


Additional files for all supported x86-based versions of Windows 8.1

File property

Value

File name

X86_eafadce025c4eb89d1a260f6f08b1178_31bf3856ad364e35_6.3.9600.17794_none_b606f6f79ef95aa5.manifest

File version

Not applicable

File size

703

Date (UTC)

09-Apr-2015

Time (UTC)

19:16

Platform

Not applicable

File name

X86_microsoft-windows-directx-rgbrast_31bf3856ad364e35_6.3.9600.17794_none_08ed0840131ba3e5.manifest

File version

Not applicable

File size

2,960

Date (UTC)

08-Apr-2015

Time (UTC)

23:14

Platform

Not applicable


Additional files for all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2

File property

Value

File name

Amd64_eafadce025c4eb89d1a260f6f08b1178_31bf3856ad364e35_6.3.9600.17794_none_1225927b5756cbdb.manifest

File version

Not applicable

File size

705

Date (UTC)

09-Apr-2015

Time (UTC)

19:16

Platform

Not applicable

File name

Amd64_fb2970d7f3eb51f2da433725f5a1ed8f_31bf3856ad364e35_6.3.9600.17794_none_7d9bdcbe9da3e07d.manifest

File version

Not applicable

File size

707

Date (UTC)

09-Apr-2015

Time (UTC)

19:16

Platform

Not applicable

File name

Amd64_microsoft-windows-directx-rgbrast_31bf3856ad364e35_6.3.9600.17794_none_650ba3c3cb79151b.manifest

File version

Not applicable

File size

2,965

Date (UTC)

10-Apr-2015

Time (UTC)

17:31

Platform

Not applicable

File name

X86_microsoft-windows-directx-rgbrast_31bf3856ad364e35_6.3.9600.17794_none_08ed0840131ba3e5.manifest

File version

Not applicable

File size

2,960

Date (UTC)

08-Apr-2015

Time (UTC)

23:14

Platform

Not applicable





Status

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

References

See the terminology that Microsoft uses to describe software updates.

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