Can't seem to locate a certain folder/files?

Been looking through the files, and for example "engine_fire.xml" has the diffuse in sfx/particles, but I cannot find any sfx folder that has "particles" and that specific .tga file? Where am I looking wrong here?

The path: Diffuse="sfx/particles/dust_atlas__d_a.tga"

last edited by Digital X

Doh! thanks. Didn't even think of looking in the zips lol. I was looking for folders straight up.