Pcb board electric and magnetic field simulation.

I have designed a pcb for power led drivers and now i want to simulate the electromagnetic fields created around this pcb. I have dxf file and want to simulate it in CST MWS but I cannt't import this dxf file in cst. can anyone tell me how to import this file to cst and guide me about pcb simulations in cst because this is my first experience with cst pcb.

regards.