I took a look at it, but before I hand out the solution: I often browse this page from my phone and can't really troubleshoot pk3 files on the go, especially with shaders or other text based files that cause you trouble you could just post them here in spoiler and code tags. That way whoever is going to try and help you solve your problem can just look right at what's causing the problem. A more detailed description of the problem would have been great aswell, because I had no clue what to expect when I downloaded and dropped the file in my basefolder. It could have been anything from "the shader does nothing" to "It doesn't look as I wanted it to". Knowing what type of problem you're looking for can be a tremendous help. Anyway, now onto fixing the issue: The guy that made this hilt model for you used \ instead of / when specifieing the shaderpaths for the model, because of this the game doesn't find your shader for that texturepath. So the shaderpath in your .shader file was:
models/weapons2/saber_pre/prehilt
While the .md3 file is looking for:
models\weapons2\saber_pre\prehilt
In theory this shouldn't cause any issues but for some reason it does in games absed on this engine, I guess it was an oversight during coding. The fix is to just replace / with \ in your .shader file, like so: