Yea is right but when you export the .png how you can import the .png File? (This was my first problem too)
For Example i used the a\0\8\3 dec_2465.bin (that is the Aether Fundation Outside Texture)
1. Unpack this with Pk3Ds (!!!NOT WITH OHANA REBIRTH!!!)
Pk3Ds Create a dec_2465_BG Folder...