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Projects which look like Ruby or Rails projects will be badged in Open Project dialog and when the user confirm the opening of non-NetBeans Ruby project the dialog saying "Will create NetBeans metadata, ..." pops-up and after confirmation the project will be set up and open. Wizard from existing sources are too awkward.
In the meantime you might utilize: http://pastie.org/322423 More on: http://blogs.sun.com/martink/entry/open_simply_whatever_non_netbeans