A Sim File is the basic file that contains all information for making a simulations. The sim file can be in two different modes: A completed simulation document (1) or simulation document that is made for a simulation to be done (2). Only the later type of document can be edited by the user. However, a completed simulation document can be used as a template to make a copy to a new document that contains exactly the same run information as was used for the previous completed simulation.
The Sim file also includes the name of the linked input files to the simulation