Article ID: 2778964 - View products that this article applies to.
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:
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.
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.
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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.
Use the following steps to determine the bitness of Office you are using.
Article ID: 2778964 - Last Review: September 4, 2013 - Revision: 3.0