Message files Message files centralize strings and larger texts identified by a number, that can be used in programs. Understanding message files This is an introduction to message files. Syntax of message files (.msg) A message file contains a set of messages identified by an integer number. Compiling message files The .msg message files must be compiled to .iem binary files, in order to be loaded by the runtime system. Using message files at runtime Examples Message files (.msg) usage examples.