BinaryReader binReader = new BinaryReader( );

byte  [] byteArray  = binReader.ReadBytes( (int) binReader.BaseStream.Length );
float [] floatArray = new float[byteArray.Length];

for( int i = 0; i < binReader.BaseStream.Length; i += 4 )
    floatArray[i] = BitConverter.ToSingle( byteArray, i );