This is a Windows system installed file with Windows File Protection (WFP) enabled.
There are 49 versions of msvidctl.dll in the wild, the latest version being 6.05.9600.16384 (winblue_rtm.130821-1623). The average file size is about 1.64 MB.
(Note, the behaviors below are for all versions of msvidctl.dll, select a unique version for details.)
Marked as a safe ActiveX control for Internet Explorer (digitally signed with script execution permission)
United States installs about 57.50% of DirectShow.