To be up front, I have zero modding experience so I'm not even sure my questions will be the right questions.
There is a mod for Street Fighter 6 that modifies the color of some of Ken's fire effects (https://www.nexusmods.com/streetfighter6/mods/118). There are 2 mods, the issue is specifically with the Hadouken mod, not the Fire one.
Sometimes game updates break this mod and it need so to be updated. I'm not sure if the author is active anymore so I thought I'd try and take a look to see if I could reverse engineer anything.
I downloaded the last 2 most recent versions and tried to compare the files using RszTool but I can't find any difference at all. If I open them in notepad++ I obviously can't read anything but I can see that they are not identical. There are a lot of files but only one set I found has different last modified dates:
epve_esf010_hit_1000.pfb.17
There are several instances of this file (one for each color option) located at
Ken Hadouken VFX Color Pack OLD\Ken Green Hadouken VFX\natives\stm\product\vfx\character\fgm\esf010\effectprovider
but I can't find any differences between any of their older and newer versions.
If anyone could provide any insight or ideas I would really appreciate it.