using dst files

i have a disk with embroidery designs that are in the dst format but my computer wont open it up it does not recognize the dst format what do i need to do to my computer to be able to open up my disk is their softwear i need to install if so can anybody recomend one thanks sheila

You need embroidery software, and there are many to choose from.
What sewing machine do you have, and do you know what file extension you need for your particular machine?