Version-neutral, bit-neutral Internet Explorer add-on for IE6,
IE7, IE8 and IE9 (32-bit and 64-bit) in VB.NET, C#, C++

Add-in Express™
for Internet Explorer® and Microsoft® .net

Version-neutrality - your project works for IE6, IE7, IE8 and IE9

Add-in Express delivers version-neutral interop assemblies based on the Internet Explorer 6.0 type library. Using these assemblies you can program version-neutral Internet Explorer add-ons compatible with all subsequent IE versions, that is IE 6 - IE 9. However, you can develop add-ons compatible with IE 8 and 9 if you create an add-on solution on a PC with IE 8 installed - simply use the interop assemblies for the currently installed IE version. In this case, the interop for the installed IE version will be generated on the fly and included in your solution automatically:

New Project Wizard for IE add-ons

Stop counting bits - all your add-ons are bit-neutral

By default, all your solutions based on Add-in Express are compiled for any CPU. So all your solutions are platform-neutral (or bit-neutral). However, to make your add-ons more secure and stable, Add-in Express isolates each of them in separate application domains by using a special Win32 "shim", the Add-in Express Loader. There are two versions of the loader, one for 32-bit and the other for the 64-bit CPU. Both versions are included in IE add-on setup projects and are separately registered for 32- and 64-bit versions of Internet Explorer. You don't need create special actions in your setup projects - all custom actions needed for add-on registration are generated automatically.

A new add-on project in the Solution window of Visual Studio
See Also