This is a Windows system installed file with Windows File Protection (WFP) enabled.
ikeext.dll has 30 known versions, the most recent one is 6.3.9600.16384 (winblue_rtm.130821-1623). The average file size is about 759.38 KB. This is a .NET Common Language Runtime (CLR) assembly.
Internet Key Exchange (IKE or IKEv2) is the protocol used to set up a security association (SA) in the IPsec protocol suite. IKE builds upon the Oakley protocol and ISAKMP.
(Note, the behaviors below are for all versions of ikeext.dll, select a unique version for details.)
United States installs about 45.32% of IKE extension.