This is a patch to make mod content overwrite existing content (not the Core files themselves, but everything created from them), which I felt was something really missing from the modding side of the game. Previously, in order to do something like make the main character start with different armor, you had to edit the Core file itself. It's not really a big deal to have to edit the Core file... but what if there were 5 different mods all changing different properties of the main character? Well, this patch makes it so 5 different mods can do exactly that.
Note: If mods are trying to overwrite the same properties of the same objects, then whatever is loaded last will 'win' (they load in alphabetical order).