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creo3 config.pro option documentation for: EXPORT_3D_FORCE_DEFAULT_NAMING            

export_3d_force_default_naming

yes , no *
Determines whether to use the Creo application file names when exporting to STEP.
yes - Uses the application file names when exporting to STEP. You must accept the default file name. Does not prompt you to specify a file name before continuing with the export.
no - Prompts you for the name of each STEP file.