Black Ops 1 - Texture modding/editing problem

[[GER]Black_Ops]

Hello,

I saw House´s tutorial for this and it is really good. But at the end, it didnt worked on my black ops . I edited some zombie textures in photoshop, saved this, convert the files to .iwi and used the HxD editor... But at the end my Black Ops says that it can´t load : localized_german_iw01.iwd . What can I do? :/