Problem with emissive texture

Hi guys. I try to get emissive texture on custom items. From what I read on the internet it should have been as easy as to put a file_e in the CIT folder. But it does not work..? Any ideas? Is there a line to put in the properties files to bring the path of the _e fils in the CIT folder?

Other emissives textures does works fine (inculding ranbom mobs)