Sprite Stitch Board!

Hello, im fresh new here, not even stitched anything ye, but i got a yoshi's towel from xmas and fell in love. I would like to know what program do i use to open .sth? And where cna i download it?

Thanks everyone!

KG-Chart and you can download it here http://www.iktsoft.net/kgchart-en/kgchart/ but it is Windows only.

Thanks!