The following dialog can be accessed through the menu Data->Select Data Source ....
Here can be selected from where to load the data for races, cultures and professions. If the Data Source is set to "Basic Rules (internal)", the data that is stored internal in the program, is used.
Another option is to select a directory, from where to load the data. If a new, empty directory is selected, the data currently used by the program is stored in that directory. For this purpose three subdirectories races, cultures and professions are created. New created races, cultures and professions can be placed in this directories.