The same rules apply. If you upgrade Windows 8
to Windows 8.1 Preview
you will have to reinstall all your desktop and Windows Store
applications once you upgrade the Windows 8.1 Preview
to Windows 8.1 RTM
. Every single one of those FAQ applies to both Windows RT
and Windows 8
.
The important information is the following statement.
When you install subsequent editions of Windows 8.1 you'll be able to
keep your personal files, but you'll need to reinstall your apps.
If upgrade to Windows 8.1 by using the Windows Store
update or you use a Windows 8.1 RTM installation media you will keep all your personal files, settings, and installed applications. Any Windows Store
applications in either case will be downloaded again and be updated as required.