How do I create an IE add-in in .NET?
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The short answer is, don't. Just don't.
Details are in Create Shell Extension ...
since IE and Explorer are the same component with a different skin, you will face the same problems.
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You can check this url:
http://www.codeproject.com/KB/shell/dotnetbandobjects.aspx
he's in the business of building an extension for Windows Explorer, but I know it is very similar for IE.
This is the library that qttabbar uses for example:
(as I said, it can be adapted to IE).
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