A United States court has delivered another legal setback to Kim Dotcom with the United States Government winning a civil forfeiture case against the mogul.

As a result Dotcom has lost an estimated $67 million worth of assets to the United States including millions in cash, property, luxury cars, jet skis, large screen televisions and art.

Dotcom told the Herald on Sunday tonight it was not a fair trial and demonstrated the "sad state" of the United States justice system.

"By labelling me a fugitive the US court has allowed the US government to legally steal all of my assets without any trial, without any due process, without any test of the merits.

The asset forfeiture was a default judgement. I was disentitled to defend myself."

Dotcom said he would appeal the latest finding. His legal team had advised him the judgement stood little chance of surviving in New Zealand or Hong Kong courts.