More than 200,000 declassified documents are being made public. They dated from the 1940 to1944 regime of Marshal Philippe Petain.
BBC reported that during the war the Vichy regime helped Nazi Germany to deport 76,000 Jews from France, including many children.
France is also opening files from its post-liberation provisional government.
The Vichy documents come from the wartime ministries of the interior, foreign affairs and justice, as well as the police.
Some of the archives relate to war crimes investigations conducted by the French liberation authorities after the defeat of Nazi Germany.
Speaking to French TF1 television news, historian Gilles Morin said the archives would probably shed new light on the arrest of Jean Moulin, a French Resistance leader who died after his capture and tortured by the Nazis in 1943.
Police records and notes seized from French Resistance comrades will now add to the witness statements that researchers have relied on until now, Mr Morin said.
“There is also a demand from the children of deportees, and of those who were executed, who want to know – and that’s a legitimate demand,” he said.
