Thank you. Sadly, it still looks like the script in that file points to hard-coded, unchangeable data/files/functions, as I now see an old thread from 2020 where Zetnus learned via Discord they are hard-coded:
“ember particles are hardcoded, there is currently no external mod-able config file”
Source: Remove cinder particles from main menu (particle texture location) - #7 by Zetnus
A few posts later, Zetnus mentions some other stuff about FXO, PSO, and VSO files. Unfortunately, everyone just wants to delete the particles. I, instead, want to mod/change them. Snow for Winter. Leaves for Fall. Etc. And different particle performances (fast, windy, blustery day vs. slow, peaceful, tranquil day). More quantity, less quantity, and so on.
Hoping they can unlock these hard-coded particles someday and allow for custom sims. And also let us do the same for environment overlays for actual matches, like this concept shows: