.duc savefiles, can i make those to .sav savefiles instead, on my computer?

^^

Jup you can check this out : http://youtube.com/watch?v=F-ozfqnvkd4 go to the 2d part of it.
There you will learn how and even more.
If you dont feel like watching that just upload youre .duc save file here to make it a .sav file :
http://www.shunyweb.info/index.php
Hope it helped you ^^