You're welcome
, yes in 64 bit it is better for you to import it into each of the mod you want to create, that way you can chose which costume you want to replace the skin.
Although there's a way to replace all costume skin that uses a specific skin texture,
Tutorial , with this way I can replace almost all skin texture of event costume, but this end up making the mod file really big, around 3-2 gigabyte, and it only replace most of the skin texture, so yeah.., it's super inefficient.