There'll be a file with the extension .txi, with the same name as the texture. You can copy that and rename it to the name of the texture you want to be animated.
Is that a necessity (the .txi will only be read if it has the same name), or a good practice? Because I am currently puzzling about the behavior of some models I've been salvaging from the haks of my old PW. A bow which looks fine when seen in Gmax or NWExplorer, but applying the texture "twisted" within Aurora, and a reskin of the Earth Elemental which still shows the magma-glow to some degree. Already guessed that missing .txi files might be responsible, but there are none corresponding to those models and their textures, as far as I can tell.