Add Windows app store types

MSIX and APPX have the same descriptions because MSIX is essentially the new version of APPX. For now, app store apps have to be unzipped before running them in Wine, but I expect that a future version of Wine will support double-click installation.

https://learn.microsoft.com/en-us/windows/msix/app-installer/web-install-iis#step-7---configure-the-web-app-for-app-package-mime-types