It has been removed when the extentions feature has been introduced.
Now, when -f is used in the command line, a list of extensions is
displayed to request the user to choose the extension that needs to
handle this file.
The objects introspection, that has always been as a core part, is now
an extension, and can be not used.
The directories structure allows other extensions to be developed inside
the Clouseau tree, even if they can be developed outside.
Other extensions will be added and the extensions feature will be
adapted to fit all their requirements.
Daniel Zaoui