The machine should have come with software and an interface. You probably need to purchase the Babylock software:
http://www.babylock.com/software/palette-pts/
There are also older versions of PE Design on ebay:
http://www.ebay.com/itm/PE-DESIGN-Version-4-0-/251015163747 and
http://www.ebay.com/itm/Brother-PED-Basic-Embroidery-Software-w-card-box-good-condition-/190652452504
You can also download a free program called Wilcom Truesizer.
http://wilcom-truesizer.en.softonic.com/
With this software you can open the files, view them, and actually resize them.