This is a Windows system installed file with Windows File Protection (WFP) enabled.
There are 65 versions of wkssvc.dll in the wild, the latest version being 6.3.9600.16384 (winblue_rtm.130821-1623). The average file size is about 139.65 KB. The executable is a .NET framework assembly utilizing the CLR.
(Note, the behaviors below are for all versions of wkssvc.dll, select a unique version for details.)
United States installs about 35.77% of Workstation Service DLL.