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ViMaCore is a DLL (ViMaCore.DLL for MSFS 2002 / ViMaCore2004.DLL for MSFS 2004) which is loaded by Microsoft Flight Simulator and provides custom DLL's with an interface to some of Microsoft Flight Simulator services as well as additional services (aka known as API functions) of its own.
ViMaCore is used by most VistaMare Software add-ons for Microsoft Flight Simulator and it is required to run them.