Hello Wulfy. I will try and answer your question here so others might see it.
Get gunfire effects from 'video update 10' into 4.12?
The java stuff (example FC34140EDAF31A16) holds the necessary information to the gun and arty classes. In there you will find the color of the reflection emit, muzzle flash name and folder hierarchy, bullet smoke trail name(if applicable), shell ejection names, smoke effect for muzzle, etc. All of these class files would have to be in your MODS folder, with all the correct .eff, .mat, and texture files. I imagine if everything isn't absolutely in place there will be CTD. The right way to do this would be to decompile every class file within the 'Steppenwolf's Effects and Tweaks' for Arty classes and Mgun classes, note all file paths and names for effects, then take those effect files(found within the LowerParticleEffects folder) and put them in your MODS folder. This I would try to do one gun at a time to make sure everything works right(if you have the time). Of course something could have been changed in 4.12 that would render everything uesless. In that case you would still have to decompile all the weapons java(after finding them) and manually type in the effects files you want it to pull and still put everything in place. Either way, it's a whole lot of work. Another, more careless, option would be to move all the Arty and Mgun classes to your MODS folder then rely on me to remember all the correct .effs necessary for the effects to work(questionable). You would then need to go through the .effs I suggest and find all the correct .mat and .tga files, then put them in place. It could work though. And if you get a CTD, just check the log file and it will tell what the problem was. Remember which plane you were testing, make the necessary changes, then retest. Let me know and I'll look through the mod for the right .effs. I'll have to post them later tonight though.