> The thumbnails themselves are stored in extended attributes of the files themselves, which means applications can create their own thumbnails for custom filet

> The thumbnails themselves are stored in extended attributes of the files themselves, which means applications can create their own thumbnails for custom filetypes, if they want (for example, a screenshot might be the thumbnail of an emulator’s save-state.) This is pretty neat. Is it something that script-type applications can do, as opposed to more formally-programmed applications? Or for that matter is there that kind of system scripting language for the OS, like an ARexx for Haiku? I've used Haiku but not at this level.