D'oh! Right answer to the wrong question...sorry about that.
I believe the file yo uare looking for is one of these:
willk@penguin1:~$ locate .menu
/etc/mc/mc.menu
/etc/xdg/menus/applications.menu
/etc/xdg/menus/applications-merged/exclude.menu
/etc/xdg/menus/applications-merged/kde-essential.menu
/etc/xdg/menus/applications-merged/openoffice.menu
/etc/xdg/menus/debian-menu.menu
/etc/xdg/menus/kde-information.menu
/etc/xdg/menus/kde-screensavers.menu
/etc/xdg/menus/kde-settings.menu
/usr/share/doc/menu/examples/exclude.menu
/usr/share/mc/cedit.menu
/usr/share/mc/mc.menu
/usr/share/mc/mc.menu.sr
/var/lib/menu-xdg/menus/debian-menu.menu
willk@penguin1:~$
I checked one of these and it seemed to have the layout of my menu. I could be wrong, but check here:
http://people.fruitsalad.org/phil/kd.../kde-menu.html
There are some cool details about how the whole menu system works and may help with your question.