Meaning of unregistered company clarified to exclude registered entities and certain railways, and include partnerships exceeding membership threshold. The provision defines 'unregistered company' for winding up purposes by excluding railway companies incorporated by statute, companies registered under the Companies Act, and companies registered under prior companies law except those with registered offices in specified territories before separation; and by including any partnership, association or company that, when the winding up petition is presented to the Tribunal, consists of more than the statutory number of members.