And those files wasn't even the game's main assets data, but it's a RAW 16-bit PCM audio data (in other words, CD audio tracks for the game's BGM).
The files you need are inside the CDALL.BIN and CDINDEX.BIN if you really want to modify the game.
Anyway, here's the QuickBMS script for those files:
open FDSE CDINDEX.BIN
open FDSE CDALL.BIN 1
IDString "TWC2002 "
get FILES long
for i = 0 < FILES
get OFFSET long
get SIZE long
log "" OFFSET SIZE 1
twc2002.bms [171 Bytes]
Downloaded 7 times
Don't expect any real filenames, there's nothing in the game's data that references it, even on the main executable file (SLUS_014.64)
Good news is, most of the game's textures are in TIM format, so it should be compatible with any PSX editing tools.