This is a Windows system installed file with Windows File Protection (WFP) enabled.
zipfldr.dll has 43 known versions, the most recent one is 6.1.7600.16385 (win7_rtm.090713-1255). The average file size is about 664.57 KB.
Compressing files, folders, and programs decreases their size and reduces the amount of space they use on your drives or removable storage devices Drive compression decreases the amount of space used by all of the files and folders stored on that drive.
(Note, the behaviors below are for all versions of zipfldr.dll, select a unique version for details.)
Located in the registry at 'SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved'
United States installs about 49.44% of Compressed (zipped) Folders.