Hello Dear,
open programm, klick import from folder, import file, click on the file in case there are a frame and red dots in the corners. When they disappear, you can save the file as pes by clicking the left corner of your programm.
Can't you open it as SEW and then find Save As?
The problem is I cant get it to open. Will try again after the next coughing fit... Its a jolly little bug!