Kim Dotcom will today ask the High Court to force government agencies to hand over information he believes they hold about him.
The internet businessman has already had his bid against both Immigration and the Security Intelligence Service rejected twice by courts, most recently last month.
Mr Dotcom is now seeking a judicial review of the district court decisions, in a hearing at the High Court in Auckland today and tomorrow.
Mr Dotcom's lawyers have argued the two agencies should reveal all documents they hold about his application for permanent residency, which was granted in 2010.
They say some information the agencies have released backs up his client's theory he was granted residency because it would make it easier for the Federal Bureau of Investigation to extradite him to the United States.
They say that creates grounds for the organisations to hand over anything else they might have.