The only files I see there that aren't cinematics or images or videos are the PIG*.USR archives.
They seem to contain raw data or raw images, probably they are a video/image format too:
get FILES long
for i = 0 < FILES
get OFFSET long
get SIZE long
log "" OFFSET SIZE
I guess DATA.Z and DATA2.Z are part of the installer and contain other files like PIG5.USR and so on.
Check in your game folder if you already have that file.