This is a Windows system installed file with Windows File Protection (WFP) enabled.
There are 37 versions of lmhsvc.dll in the wild, the latest version being 6.3.9600.16384 (winblue_rtm.130821-1623). The average file size is about 15.72 KB.
NetBIOS over TCP/IP (NBT, or sometimes NetBT) is a networking protocol that allows legacy computer applications relying on the NetBIOS API to be used on modern TCP/IP networks.
(Note, the behaviors below are for all versions of lmhsvc.dll, select a unique version for details.)
United States installs about 42.67% of TCPIP NetBios Transport Services DLL.