I am looking to buy the Bernette Deco 340 especially because it makes use of a USB port to transfer files to the Embriodery Machine. I have been told that it uses a exp+ file extension, but I only seem to be able to find designs with an exp extension. Can anyone tell me what the difference is between the two. I have used Buz Tools for many years, but they also do not seem to have the facility to convert to "exp+" and I am concerned that I may be stuck for designs. Will any USB Memory stick work on this machine, or does it have to be the one purchased from the Bernina agents?