This is a Windows system installed file with Windows File Protection (WFP) enabled.
printui.dll has 50 known versions, the most recent one is 6.2.9200.16384 (win8_rtm.120725-1247). The average file size is about 769.57 KB.
(Note, the behaviors below are for all versions of printui.dll, select a unique version for details.)
Located in the registry at 'SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved'
United States installs about 44.74% of Print UI DLL.