CAD file created with Multisim, a program used for printed circuit board (PCB) design, simulation, and analysis; stores a circuit schematic designed by the user; can be simulated in the software to analyze the circuit. MS11 files can be combined into Multisim projects, which use the .MP11 extension. NOTE: Previous versions of Multisim used the .MS7, .MS8, .MS9, and .MS10 extensions for saving circuit designs.