In a development likely to be seen as further weakening Lagarde's position at the helm of the global lender, Richard was placed under formal investigation for fraud as part of an organised gang.
The crime is considered a very serious one in France and it carries a maximum potential sentence of ten years in prison and a million euro fine.
The board of Orange will meet in the next few days to decide whether Richard will have to step down from his role as chairman and chief executive while he fights the charges, aides to Prime Minister Jean-Marc Ayrault said.
Richard was Lagarde's chief of staff when, in 2008, she sanctioned a state payout of USD 515 million to disgraced tycoon Bernard Tapie.
More From This Section
Lagarde is suspected of having rigged the process that led to the payout, thus ensuring Tapie would get the cash in return for supporting her boss, Nicolas Sarkozy, in his successful 2007 presidential election campaign.
The IMF chief was questioned for two days in May about her role in the affair. She was not placed under formal investigation -- the French equivalent of being charged in other legal systems -- but she remains what is termed an "assisted witness", which means judges can summon her for further interrogation at any time.
Tapie claimed that Credit Lyonnais had defrauded him by intentionally undervaluing Adidas at the time of the sale and that the state, as the bank's principal shareholder, should compensate him.
Lagarde was responsible for referring the issue to a three-man arbitration panel, which ruled in Tapie's favour.
One member of the panel, Pierre Estoup, 86, was placed under formal investigation last month on the same charge that Richard now faces.