Whoops! I am an idiot. That is completely correct and it just now struck me. My bad!
Looking further, now I'm really wishing my code skills were better because I've found the functions that go into ripping the DFA and CFA files. Apparently they are RLE compressed and muxed, whatever that latter portion means... the first being one of the few ways that BMP files can be compressed, I think. (Apart from putting them inside a compressed archive, I mean.)
EDIT: AHA! I may have found a bassackwards way of getting the files! There's a program called BSA_F-EX that can extract and reinsert all of the files in a BSA. With any luck, I should be able to make a copy of Arena and insert Terminator graphics into it for extraction by either just straight up adding them or by replacing current entries, depending on how the program works. In either case, all it should take then is a simple palette swapping and I should have everything.
Since I've got it now, by the way, would anyone care for a full rip of Elder Scrolls: Arena? Don't believe I've ever seen a rip of that around here.
EDIT #2: Slowly but surely I am getting this prepared. Here's how it works: the files from Terminator Rampage all had to be hand renamed to files within the BSA of TES:Arena of the same type. BSA_F-EX is then used to slowly and painstakingly import the TR info one by one. (And by painstakingly, I mean it; it resets your view after every single file [you can't batch import] meaning that you have to try and remember the last file you did every single time.) However, the good news is that WinArena can still open with the edited BSA, meaning that all I'll have to do once this pain in the ass is through with is dump them and apply the Terminator Rampage palette to the images. (Hopefully.)
EDIT #3: SUCCESS! It took even more finagling than grabbing System Shock's resources, but I have finally managed a world first: rips of Terminator Rampage's enemies, weapons, and compressed textures. Using the above method, I was able to rip the graphics perfectly (without even needing to do a palette swap). I should have them available by tomorrow at the latest; I can't upload them as they are presently due to the fact that they're currently animated GIF images and sheets of half TR textures and half Arena textures. Once I split everything up, I'll add them to the pack. Examples below to show you I'm not pulling your leg!
REMEMBER, YOU SAW IT HERE FIRST!