How do you write to your memory card? Do you have a box that it goes into? If so, it should show up as a drive on your computer and you could possibly just drag and drop.
I use another program, Embird, to adjust my designs and then I save them to my memory card and take it to my machine. I can also connect directly from my machine to my computer and save directly to the machine.
I don't have a Janome, but I'd imagine it might be similar.