Find the .paa attached.
Face textures are located in <your ofp game directory>/Dta/Data.pbo (you'll need to depbo it) and all begin xicht_
In order to tell which xicht_
file belongs to which face, take a look in the CONFIG.BIN in the <your ofp game directory>/bin/ folder and search for "face".
And finally, in order to visually determine which face you want match with its xicht_
file, I recommend Artak's excellent face resource