Compatibility update for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2: April 2015

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 Essentials

This compatibility update is a software update that improves the compatibility experience in Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2. Microsoft regularly releases Windows compatibility updates to improve the overall user experience.

This compatibility update is dated April 2015.

For more information about the improvements, see the "Applications or devices that experience a change in behavior after you install this update" section and the "Applications and devices that are included in this update" section.

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 available from Windows Update.

Method 2: Microsoft Download Center

The following files are available for download from the Microsoft Download Center:


Operating systemUpdate
All supported x86-based versions of Windows 8.1Download Download the update package now.
All supported x64-based versions of Windows 8.1Download Download the update package now.
All supported x64-based versions of Windows Server 2012 R2Download Download the update 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
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Update information


The kinds of problems that are resolved by application compatibility updates

When you try to install and run certain games or applications in Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2, you may experience one or more of the following symptoms:
  • The game, the application, or the driver is installed incorrectly.
  • The game, the application, or the driver causes system instability.
  • The primary functions of the game, the application, or the firmware do not work correctly.

Applications or devices that experience a change in behavior after you install this update

The following table lists the applications and devices that were included in this cumulative update package. This table also describes the behavior of these applications and devices after you install the update.

Compatibility updates trigger several changes in Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2. The following are the most common:

Hard block

This prevents an application that is incompatible with Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2 from running on the system.

Note Microsoft enables Windows to put a hard block on a non-Microsoft application only if the manufacturer is notified.

Soft block

This notifies you when a primary function of the application may not work or may cause application instability.

Driver block

This may block an existing driver on your computer. When the driver is migrated during the upgrade, an Inbox driver will be installed.

Applications and devices that are included in this update

Applications or DevicesVersionBehavior after you install the update
Microchip HUBnot availableStorage devices that are connected to the Microchip hub works correctly after safe removal.
PSC (Datalogic) Scannernot availableEmbedded scanner under xHCI controller works correctly.
AMD USB xHCI Controllernot availableEliminate the AV_USBXHCI!Bulk_Transfer_CompleteCancelable crash.
AsMedia USB xHCI Controllernot availableEliminate the AV_USBXHCI!Bulk_Transfer_CompleteCancelable crash.
ETron USB xHCI Controllernot availableEliminate the AV_USBXHCI!Bulk_Transfer_CompleteCancelable crash.
Intel Pantherpoint xHCI Controllernot availableEliminate the AV_USBXHCI!Bulk_Transfer_CompleteCancelable crash.
Intel Lynxpoint xHCI Controllernot availableEliminate the AV_USBXHCI!Bulk_Transfer_CompleteCancelable crash.
NEC Renesas xHCI Controllernot availableEliminate the AV_USBXHCI!Bulk_Transfer_CompleteCancelable crash.
NVidia xHCI Controllernot availableEliminate the AV_USBXHCI!Bulk_Transfer_CompleteCancelable crash.
VIA xHCI Controllernot availableEliminate the AV_USBXHCI!Bulk_Transfer_CompleteCancelable crash.

References


See the terminology that Microsoft uses to describe software updates.