The Fiji Labour Party is filing its appeal against the regime's political party decree this afternoon.
Sources have confirmed the party is also re-registering but under protest, so it doesn't prejudice the court action.
The Political Parties (Registration, Conduct, Funding and Disclosures) Decree requires all of Fiji's political parties to re-register with a required five thousand members, spread across the different divisions.
Rajendra Chaudhry, the son of the FLP leader, Mahendra Chaudhry, had said earlier the appeal was being filed on behalf of the parties.
Chaudhry said he was engaging the services of a senior counsel to argue the matter on behalf of FLP, SDL, NFP and UPP, along with Fiji Islands Council of Trade Union.
The UPP has since disbanded with the president, Mick Beddoes, opting to join the SDL party, which has been renamed the Social Democratic Liberal Party, also as a result of the new decree.
FICTU has also experienced changes since the plan to appeal with the general secretary, Attar Singh, being forced out of the National Federation Party.
Singh had previously stood under the party ticket but last weekend stepped down, along with Pramod Rae, who had also been targetted by the decree.
NFP was to this afternoon re-register and along with SDL was the first party to reveal its plans. Its re-elected party president and Suva lawyer, Raman Pratap Singh, told media the application was being made at 3pm at Suvavou House.
Singh said NFP had signed up more than 5005 members and was looking forward to continuing for another 50 years.