It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all). We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera
I did some tests on a Virtual PC. That Wine program is pretty cool. It seems to run Meltdown ok on Linux. Since Duke itself needs to run through Wine, I don't think it's a big deal whether the launcher can run natively on a platform.