You should be able to extra the design in the format that your machine uses. I delete the other file extensions as they aren't needed. Take the file you want directly and do a copy/paste of that file to the USB.
I also use back-up hard drives for the EMB designs. There is also an extender that has multiple plugs for USB. Plug the extender into the one port and then plug the other USB sticks into it. The embroidery machines have limits to how much they can read off an USB. I use sticks with a smaller amount of memory and only put the working designs on it.