Edgar M. Bronfman Jr., an heir to the Seagram liquor fortune, was sued Monday for $100 million by the former chief executive of publisher Simon & Schuster, who claims Bronfman failed to pay him for advising in a $2.6 billion takeover of Warner Music Group.

Richard E. Snyder said in a lawsuit filed in Manhattan’s state Supreme Court that Bronfman acted “dishonorably and unlawfully” by going back on a promise to compensate him and by misappropriating his business files and computer.