Part of the old ('classic') search result view. Since 3.0 clients can create their own search result view pages (see ISearchResultPage), leaving it up to the page
how to create actions in context menus.
public interface IContextMenuContributor
Specify how clients can add menu items
to the context menu of the search result view.
A class that contributes context menu items
must implement this interface and pass an
instance of itself to the search result view.