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Let's consider a GNU-GPLv3 desktop application.
It is not dual-licensable at all, for instance because a lot of code has been contributed as GNU-GPLv3 by people who can not be found anymore, so changing the license is not an option.
QUESTION: Can this app be uploaded to the Windows Store?
Yes.
From this article linked by Philipp, Microsoft's store allows app developers to specify any terms they desire for their application, and makes specific allowances for OSI-approved licenses.
The GPL's disclaimer of warranty/liability protects auxiliary distributors.
THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND
However, some other free software licenses do not, so they may not comply with the requirement that you disclaim Microsoft from warranty in addition to yourself.
