Wow, thank you. Sorry for my stupid question, but, in my defense, it's not very intuitive (for example there is no icon or action for that). Actually, I don't understand why this is a "facultative option" but it's fine now. The "Non use Windows Explorer for browsing" could be removed, isn't it? Last thing : the choice of the columns don't seem to be stored (when I quit Reaper and I relaunch it, it comes back without my custom columns).