The Bottle Manager sets up Menus and Associations using a variety of different system files. The particular method that is used varies by operating system. The best way to investigate where menus and associations may be placed is by running the locate_gui.sh tool.
or, as root
locate_gui.sh will list the different association and menu systems that are available on your system (e.g. Unity, GNOME, KDE) and then list the directories used to create these menus and associations.