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Addins for Office programs may be registered under the \Wow6432Node

Support for Office 2003 has ended

Microsoft ended support for Office 2003 on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

Summary
If you have a 32-bit version of Office installed on a 64-bit version of Windows, add-ins that are registered under HKEY_LOCAL_MACHINE will be registered under the \Wow6432Node subkey. For example:

HKEY_LOCAL_MACHINE\software\Wow6432Node\microsoft\office\Outlook\Addins

This is important to remember if you are troubleshooting problems in your Office programs and you need to disable add-ins. If you are not modifying the correct registry data (because you do not realize you are running 32-bit Office on a 64-bit version of Windows), then your changes will not change the add-in behavior.
More information
COM add-ins register themselves in the Windows Registry under either the HKEY_CURRENT_USER or HKEY_LOCAL_MACHINE hives. But, if you are using a 64-bit version of Windows, the subkey under HKEY_LOCAL_MACHINE will vary depending on the bitness of your Office installation. Please see the following table for the correct registry location for the different combinations of 32-bit/64-bit versions of Office and Windows.

Window bitnessOffice bitnessCOM add-in registry location under HKEY_LOCAL_MACHINE
32-bit32-bit HKEY_LOCAL_MACHINE\Software\Microsoft\Office\<application>\Addins
64-bit 64-bitHKEY_LOCAL_MACHINE\Software\Microsoft\Office\<application>\Addins
64-bit 32-bitHKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\Office\<application>\Addins
32-bit 64-bit It is not possible to install a 64-bit version of Office on a 32-bit version of Windows

Note: If you have a 64-bit version of Windows, add-ins that register themselves under HKEY_CURRENT_USER are not affected by this nuance.

Use the following steps to determine the bitness of Windows you are using.
  • Windows 7
    1. Click Start, right-click Computer and then click Properties.
    2. Note the bitness of Windows next to System type under System.
  • Windows 8
    1. Press Window + X.
    2. Click System.
    3. Note the bitness of Windows next to System type under System.

Use the following steps to determine the bitness of Office you are using.

  • Office 2010
    1. Start an Office program.
    2. On the File tab, click Help.
    3. Note the bitness next to the version number in the right-side of the Help section.

  • Office 2013
    1. Start an Office program.
    2. On the File tab click Account (click Office Account in Outlook).
    3. In the right-pane, click About <program>.
    4. Note the bitness next to the version number in the About <program> dialog box.
COM add-ins
Properties

Article ID: 2778964 - Last Review: 09/04/2013 08:59:00 - Revision: 3.0

Microsoft Outlook 2013, Microsoft Word 2013, Microsoft Excel 2013, Microsoft Outlook 2010, Microsoft Word 2010, Microsoft Excel 2010, Microsoft Office Outlook 2007, Microsoft Office Word 2007, Microsoft Office Excel 2007, Microsoft Office Outlook 2003, Microsoft Office Word 2003, Microsoft Office Excel 2003

  • KB2778964
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