The headquarters of the Rugby World CupOrganisers have been searched.
The inquiry was into the management of the committee.
The National Finance Prosecutor's Office opened a preliminary investigation.
There are allegations of favouritism, influence peddling, and corruption.
The report came from the Inspector General of Finance and the Inspector General of Education, Sport and Research.
The headquarters of the organizers in Paris are one of the points where a search is underway.
France's L'Equipe newspaper said investigators were looking into expenses.
Claude Atcher, the former chief executive of France 2023, was fired last month after an internal investigation found "alarming managerial practices".
He took over from Atcher.
The Rugby World Cup will take place in France from September to October in nine venues.
The tournament will be hosted by France in 2017.
South Africa had been expected to win the vote.