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The following gives a brief description of all files that might be created by the optimizer and when they are created. In each of these runname is the name specified for the run.

runname.out contains the parameters that give the maximum payoff.  This file is always created when the optimizer is invoked, and either OPTIMIZE or MULTIPLE_START is active.  
runname_sensitivity.tab contains information about the sensitivity of the payoff to different parameters.  This file is created if the :SENSITIVITY option is used.
runname_startpoint.tab contains the initial optimization points and the corresponding payoffs in tab-delimited format. This file is created if the MULTIPLE_START option is specified.
runname_startpoint.dat contains the initial optimization points and the corresponding payoffs in a format suitable for Dat2vdf. This file is created if the MULTIPLE_START option is specified.
runname_trace.dat contains values of the parameters and payoff over the course of an optimization in a format suitable for Dat2vdf.  This file is created if the :TRACE option is used.
runame_trace.tab contains values of the parameters and payoff over the course of an optimization in tab-delimited format.  This file is created if the :TRACE option is used.
runnname_sortsens.tab contains information about the sensitivity of the payoff to different parameters sorted by importance.  This file is created if the :SENSITIVITY=ALL_CONSTANTS option is used.
runname_endpoint.dat contains the final optimization points and the corresponding payoffs in a format suitable for Dat2vdf.  This file is created if the MULTIPLE_START option is specified and OPTIMIZER=POWELL.
runname_endpoint.tab contains the final optimization points and the corresponding payoffs in tab-delimited format.  This file is created if the MULTIPLE_START option is specified and OPTIMIZER=POWELL.
runname_vector.dat contains a list of parameters versus payoffs in  a  form  suitable for use by Dat2vdf.  This file is created if MULTIPLE_START=VECTOR and OPTIMIZE=OFF.