Where is the add-ins directory

Where can I find the add-ins directory?

PS: I want to install this manually, but my VS cannot load the addin after I put the addin.zip into "Documents and Settings\\My 开发者_运维问答Documents\Visual Studio 2008\Addins"

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I'm not sure if it can read zip files at all. Have you tried unzipping it? there should be a file .addin and a .dll at least