IMA ADPCM Sound Encoder

I am using ISE 10.1. when i try to simulate the core giving a "input.wav" file as with the specified properties.

following error occured.

ERROR:Simulator:29 - at 0 ns : Could not read binary file input.wav, because it was not written by Xilinx Simulator This is a Full version of ISE Simulator(ISim).

if you have any solution..please reply....

I had the above problem when i used ISE simulator comes with xilix 10.1. But this design correctly simulates with xilinx 12.2.