32-bit browser applications may not work as expected in Internet Explorer 10

Aplica-se a: Internet Explorer 10Windows 8Windows 8 Enterprise


When you run Internet Explorer 10 in the desktop on a 64-bit version of Windows 8, add-ons that are written for the 32-bit browser (for example, Browser Helper Objects (BHOs), Toolbars, and ActiveX controls) do not work as expected.

This issue occurs when the following registry entry is set to 0:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\TabProcGrowth


The Internet Explorer 10 Manager process is always a 64-bit process in 64-bit versions of Windows 8. This is an architecture change in Internet Explorer 10. By default, tab processes can be either 32-bit or 64-bit processes, except when the TabProcGrowth registry entry is set to 0. When this registry entry is set to 0, the tabs run in the same process as the manager process, which in this case is 64-bit. However, some browser add-ons do not have a 64-bit version. Therefore, they do not work as expected.


Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
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More Information

For more information about the TabProcGrowth registry entry, go to the following Microsoft MSDN website:For more information about issues that may occur when you use a 64-bit version of Internet Explorer as the default version, go to the following Microsoft MSDN website: