Set the name of the simulation run.
If you are using a ? to get a File Selection Dialog, you can also add a second option after the prompt information. Use a mode of E to specify that you want the user to select an existing file so that the Save button will be relabeled Open. Use a mode of O to specify that the user should not be asked if they want to overwrite an existing file. If filename does not begin with ? you cannot specify a mode.
