a game made to be moddable does so by being desinged in a modular fashion and being stable enough to allow sweapping said modules.it also doesnt hide how its internal files work nor it enforces hard line file integrity checks.
you also need either the community for said game or the developers themselves ot release tools that can interact with the game’s files and in a lot of cases the game might have been developed with its own internal API or evne scripting language
ie: basically every unreal engine game is fully moddable because the engine has its editing tools available to the public and its intenral scripting language is extensively documented
another example involves the later fallout game(post FO2) that the developers also releasing the respcetive version of the G.E.C.K creation kit tools that allow modders ot map edit and alter the game’s scripts.
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