Extensions (label): displays the list of extensions recognized for this system. Only files containing these extensions will be displayed in the database. This list is fed by the file
%appdata%\Nexouille soft\arrm\database\systemes_extensions.txt which contains the extensions recognized by Recalbox,T Batocera AND Retropie. if you wish to remove/add extensions, refer to the files '_lisezmoi.txt/_readme.txt' for Recalbox and '_infos.txt' for Batocera present in each system directory which contains the list of recognized extensions. You can edit this file via the configuration panel, 'General options' tab, 'Edit Extensions' button. You will need to restart ARRM for the changes to take effect or click on
refresh icon. For more info:
ARRM does not show all my games. How to add an extension?