Thank you very much! I think I found the problem... The game only dumps textures of the levels and assets that are loaded in. That means i would've to play the entire game through with the option to dump textures. I tried to play past the tutorial and the new dump has the ground textures of the first level after the tutorial. The dump itself is a good one besides the 5000 same icons produced, which can be easily located thanks to your method. But maan... i wanted to play the game in HD for the first time in X years. I have some comparision pictures:
View attachment 406623
Here is the game without any HD Textures at all. This is the first level after the tutorial which was not part of the initial dump.
View attachment 406624
Here you can see the difference on the main character (orange girl). You can clearly see the better shoulderpads.
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Here is a closeup. The orange girl has your upscaled textures, since she was in the tutorial. The blue girl came after the tutorial and is not upscaled to HD. Huuuge difference.
What i am trying to do next is to find someone to play the whole game. It is a BIG RPG so the upscaled textures should be around 1-3 Gigabytes with an actual full dump.
Anyway, big thanks for your help you made it really easy to understand the whole process.
Edit: Do you know a way to get through the whole game and collect all textures? Or any other process to collect ALL textures?