However, some browser add-ons do not have a 64-bit version. 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. By default, tab processes can be either 32-bit or 64-bit processes, except when the TabProcGrowth registry entry is set to 0. This is an architecture change in Internet Explorer 10. The Internet Explorer Manager process is always a 64-bit process in 64-bit versions of Windows 8 or later operating systems. HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\TabProcGrowth Cause This issue occurs when the following registry entry is set to 0: When you run Internet Explorer 10 or Internet Explorer 11 in the desktop on a 64-bit version of Windows, 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. Original product version: Internet Explorer 11, Internet Explorer 10, Windows 8, Windows 8 Enterprise Original KB number: 2716529 Symptoms This article provides a workaround to solve the issue that some 32-bit browser applications not working as expected in Internet Explorer. The same IE11 apps and sites you use today can open in Microsoft Edge with Internet Explorer mode. The Internet Explorer 11 desktop application will be retired and go out of support on J(for a list of what's in scope, see the FAQ).
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