The file is named "menu_def.pro" and can be located in the same places that config.pro can be located.
The general format of each line in the file is:
Spaces in the menu name or option should be replaced with a pound sign (#).
Here are few lines from mine:
This can only be used to define a default for menus that do not already have a default.
If a menu already has a default, you cannot change it. Attempting to do so will have no affect.
The file name is "menu_def.pro" and it shall be placed in "loadpoint/text"