Windows Vista build 5221 (vbl ux dev checkin gamesux)

Images of this build was shown by WinBeta.pl, however its existence is highly doubtful due to the compilation date being way before the vbl_ux_dev_checkin version of build 5212 and build 5219 was compiled. It also has a build lab never used before - "vbl_ux_dev_gamesux"