In a statement, Mohamed al Fayed, whose son Dodi Fayed was also killed in the 1997 Paris car crash, said Diana's claims of a conspiracy to kill her should have been included in the British evidence.
French lawyers for Mohamed al Fayed have filed complaints with the Paris District Court against Lord Condon, former commissioner of Britain's Metropolitan Police, and Sir David Veness, former assistant commissioner. The statement said an investigating judge would likely be appointed to the case within three weeks.
Condon and Veness learned in October 1997, two months after the crash, that Diana had told her lawyers in 1995 of a possible conspiracy to kill or seriously injure her in a road accident.
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Al Fayed, owner of Harrods department store, has long held that the couple were victims of a plot. In December, a sweeping British police investigation ruled out a murder conspiracy.
Al Fayed filed his complaint in a French court because the French judicial proceedings in the case are finished. Lord Condon has said he cooperated fully with the French investigation.
French Judge Herve Stephan published a report in 1999 saying driver Henri Paul was under the influence of drugs and alcohol at the time of the crash. The photographers who were chasing the couple's car were cleared of French manslaughter charges.
The British inquest into the couple's deaths will begin in October.