The creation of the .csv file while exporting the OptiStruct deck file can be skipped.

A log file (<SolverFileName>_Name_ID_Information.csv) is created automatically while solving or exporting the solver deck and is placed in the export location. This .csv file has some information about the exported deck i.e., loadcase names and its loads and boundary conditions names, corresponding card, and its ID details.

To skip writing this .csv file, navigate to File > Preferences > Application > General > User Defined Environment Variables and set the environment variable SIMLAB_SKIP_OS_NAME_ID_LOGFILE = True.