UPDATED 6.26pm The High Court has found Kim Dotcom is eligible for extradition.

LISTEN ABOVE: NZ Herald reporter David Fisher spoke to Larry Williams to explain what the High Court's decision means

The United States Government has been seeking the extradition of Dotcom and three other men involved in his Megaupload business, to face trial on 13 counts.

Those include allegations of conspiracy to commit racketeering, copyright infringement, money laundering and wire fraud.

A District Court decision in December 2015 found that Dotcom and his co-accused are eligible for extradition.

The High Court has now found that this decision was flawed, but that the errors in the judgment were immaterial because there are available pathways for extradition on each count.

But the Court also found Dotcom's case is not the largest criminal copyright case in New Zealand's history - as was previously claimed.

Dotcom has taken to Twitter saying "I'm no longer getting extradited for copyright. We won on that.

He adds: "I'm now getting extradited for a law that doesn't even apply."

New Zealand Herald journalist David Fisher told Larry Williams the Court's switch from copyright to fraud indicates Dotcom will be kicked out no matter what.

"The type of carry on that the Court heard was going on at Megaupload that resembles or matches up with the type of behaviour of actual crimes that are in the Extradition Act," Mr Fisher said.

Dotcom's lawyer, Ron Mansfield, said it's a disappointing day but he will continue to fight extradition - saying the outcome will be determined by the Court of Appeal.

Prime Minister Bill English's office said this afternoon it would be inappropriate to comment on the decision given the matter was potentially subject to appeal.

Should he return to the the US Dotcom would faces trial on 13 counts over his video-streaming site Megaupload.

Allegations include conspiracy to commit racketeering, copyright infringement, money laundering and wire fraud.

Dotcom will challenge the High Court's decision in the Court of Appeal.