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That could be a problem :) This is only meant to be a very rough and ready, does the job but might break stuff, sorta solution BTW

Are you sure you're not looking in STORE/ADMIN/includes/classes for the file - you should be just looking in STORE/includes/classes

This file:
includes\classes\class.CeonURIMappingAdminCategoriesProducts.php

This function:
autogenCategoryOrProductURIMapping

just before the very last line in that function add:
$uri = ...