WELLINGTON, New Zealand — The internet entrepreneur Kim Dotcom lost another bid to avoid extradition to the United States on charges of copyright infringement and money laundering, after New Zealand’s Court of Appeal on Thursday upheld rulings allowing for his deportation.

Mr. Dotcom, an online renegade who along with three associates faces the charges relating to a defunct file-sharing website, Megaupload, plans to appeal the ruling.

His lawyer, Ira Rothken, said Mr. Dotcom would appeal to the Supreme Court, New Zealand’s highest. He added that if the court agreed to hear the case, the process could take a year.

The internet mogul was arrested in 2012 as a result of a United States Department of Justice investigation into online piracy of numerous copyrighted works, including music and films. He has been fighting extradition to the United States from New Zealand since then, and is out on bail in the country’s largest city, Auckland.