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Fantastic — thank you so much for the amazingly quick response! 😊

I’ve now found UnityUnderground_Data\StreamingAssets\Textures and read the readme.txt inside the Textures folder.

I was curious, so I asked ChatGPT to walk me through exactly what would be needed to make an HD texture pack, and… unless I’m missing something, it actually sounds surprisingly straightforward:

1. Extract the original textures from the original Ultima Underworld files:
   • DATA\W64.TR → wall textures
   • DATA\F32.TR → floor/ceiling textures
   • DATA\DOORS.GR → door textures
2. Export all of them as PNGs, preserving their original order/index.
3. Batch-upscale the entire lot in Topaz Gigapixel, for example 4×, using a conservative enhancement setting — no generative redesigning or changing the artwork whatsoever, just enlarging/cleaning the original pixels while remaining faithful to the original textures.
4. Batch-rename the resulting PNGs according to the naming scheme already explained in the mod's Textures\readme.txt:
   • walls → wall000.png … wall209.png
   • floors → floor00.png … floor51.png
   • doors → door00.png … door12.png
   • and preserve the required animated variants, e.g. floor16a.png, floor16b.png, etc.
5. Drop the finished PNGs directly into UnityUnderground_Data\StreamingAssets\Textures
6. And, apparently, that's it. If I understood the readme correctly, there isn't even any need to rebuild/repack the original .TR or .GR archives: the port simply detects correctly named PNGs in that folder and uses them as texture overrides.

So this looks less like creating a conventional mod and more like a rather mechanical extract → batch upscale → batch rename → copy operation. ChatGPT could probably guide somebody through every single step and even generate the batch-renaming script in about five seconds. 😄

Unfortunately, I am absolutely not a modder, so although I can understand the procedure, I'd almost certainly find some spectacular way of turning every dungeon wall into a door and accidentally banishing the Avatar into the Windows desktop. 😂

But perhaps somebody else here has a little more experience — and more free time than the fantastic creator of this mod — and would be willing to give it a try?

Even somebody who has never made a mod before might be able to tackle this one with ChatGPT guiding them step by step.

It would be a wonderful final enhancement to an already magnificent project, letting many of us experience Ultima Underworld — in my case essentially for the first time — in probably the best form it has ever had.

Anyone tempted to take the challenge? 😁