The ToS implies that so-called authorized files can be modded, but it never specifically outlines authorized files.
In other words, while the initial forum response seems fairly cut-and-dry, EA’s legal wording on the subject is not. Under the “rules of conduct” section, the contract states all players must not “modify any file or any other part of the EA Service that EA does not specifically authorize you to modify.” Guiding users to the Terms Of Service is likely standard company policy, but actually reading the document does complicate the issue. “You should also be aware of our Terms of Service that you will have agreed to. When one user pressed for more information, an official account replied “so long as the mods do not change how the game functions and are just for visual effect then you should be OK. A forum post from EA’s community management staff provides an answer most gamers should feel comfortable with. Star Wars Battlefront 2 mods have started to appear recently, so EA clarified its stance on how it plans to tackle the issue in the months ahead.