This is a Windows system installed file with Windows File Protection (WFP) enabled.
There are 38 versions of fntcache.dll in the wild, the latest version being 7.0.6002.18107 (vistasp2_gdr_win7ip_dgt(wmbla).090924-1550). The average file size is about 1019.28 KB. The executable is a .NET framework assembly utilizing the CLR.
Windows service that optimizes performance of applications by caching commonly used font data. Applications will start this service if it is not already running.
(Note, the behaviors below are for all versions of fntcache.dll, select a unique version for details.)
United States installs about 36.18% of Windows Font Cache Service.