Thank you so much for sharing this! I bought WinStitch a while ago but it doesn't support .XSD files... And I'm broke right now so I can't pay out $60 haha
A tip for those who just want to view the XSD patterns! Or to use it in pattern keeper?
You can download the free viewer from their website. Click on "show symbols" then click "print"... And on your printer settings it should have "print to PDF"... Just save the PDF anywhere, then transfer to your phone. It works great!