The CSV file named default.csv is what runs at power up. If you make a Besavior compatible configuration the default, then you will not have access to the flash drive to make any future changes unless you also have configuration file that you can select that does allow flash drive access. If you don't understand what this all means, I don't recommend you change the default configuration and just select a Besavior after power up. CSV file names can be changed using Windows file manager.
If you decide to make any changes, first back up all your existing configuration files to your computer so you can quickly recover if things do not work out.