.dst file extension???

Greetings!  A friend needs a graphic file in .dst format for embroidery.  My question is, how does one accomplish this?  I have Corel 12 suite.  Can't find that option anywhere.  Not in Photoshop (don't dis me!) either.  Any clues, anyone?

 Thanks!

________________________________________
“Beware of artists - they mix with all classes of society

and are therefore most dangerous.”  ~Queen Victoria