![]() ![]() The Adobe Acrobat plug-in that allows Internet Explorer users to read PDF files within their browser is a BHO. Some modules enable the display of different file formats not ordinarily interpretable by the browser. BHOs can be created in any language that supports COM. If the BHO is started and implements the IObjectWithSite interface, it can control and receive events from Internet Explorer. For each CLSID that is listed below the BHO key, Internet Explorer calls CoCreateInstance to start the instance of the BHO in the same process space as the browser. Removing the registry key prevents the BHO from being loaded. The CLSID keys under Browser Helper Objects tell the browser which BHOs to load. If Internet Explorer finds this key in the registry, it looks for a CLSID key listed below the key. However, in the case of Windows Explorer, a new instance is launched for each window.īHOs are still supported as of Windows 10, through Internet Explorer 11, while BHOs are not supported in Microsoft Edge.Įach time a new instance of Internet Explorer starts, it checks the Windows Registry for the key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects. Most BHOs are loaded once by each new instance of Internet Explorer. ![]() BHOs were introduced in October 1997 with the release of version 4 of Internet Explorer.
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