Well, the export button should work already; do you have a problem with that or you mean something else?
As for windows version: not planning right now; but it is doable if people wants it.
Not sure why they would though - what is your usecase?
So, i made my character, and when i click "export" it does nothing
What browser do you use, what version?
It definitely works this way or another with chrome, firefox and safari.
It's possible you have some setting on for blocking new windows being open?
If this is an internet explorer issue it might take me a bit longer to fix; but I'd take a look over the weekend.