I have the shader converted using the asset manager, put the iwi in the images folder in the mod, as well as put "material,vending_mulekick_shader" in the mod.csv, all with no luck whatsoever. I get an error in the console of the mod builder that says
 "ERROR: Couldn't find material 'images/vending_mulekick_shader'

    failed loading 'images/vending_mulekick_shader' of type 'material' found in source file '../zone_source/mod.csv'"

and when I test in game, it shows the missing texture checkerboard. At this point I'm at a loss and any help is appreciated.