My music folder has a different icon from the other folders.Gnome use the folder-music icon to personalize the music folder icon.  I would like to know where (in which configuration file or where in GConf, DConf) this association is made.
How does Gnome make the link between my music folder and the folder-music icon?
gnome;theme;icons
/etc/xdg/user-dirs.defaults (global) and ~/.config/user-dirs.dirs (local) contain the directions to default directories. The xdg-user-dirs-update command may also be of some use to you.Edit: Sorry, I should have been far more specific. In gnome, the file manager Nautilus constantly monitors the XDG configuration files for changes, and is hard-coded throughout (for example; nautilus-icon-names.h) to match the specific pixmap to the specified XDG folder.