To all of you guys that need help finding it. You don't inject this to anything. THESE are the .rez files itself! Just rename the ending of the files.
EX: ClientFX.fcf ----> ClientFX.rez
Edit: Exactly which one do i rename? There's two of them the exact same.
REEdited: Okay I'm confused now, because there is a .rez and a .fxd file.
ReReEdited: You convert the CLIENTFX.rez file and replace those two files that are in there with the ones downloaded.