Windows Vista build 5212 (winmain)

This build leaked on 2016-12-19 at Betaarchive. Includes flip3d, and notably it reintroduced the Sidebar, but it now runs in it's own process rather than explorer.exe. Aero can be enabled on this build in VMware,unlike 5112, but it looks the same as 5112.

This is the leaked winmain compile, and it's not to be confused with the other compile, which is not leaked, and is vbl_uex.