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Thanks, i thought i had to use the same file format. So textures only get overwritten if they are dds-files? Do you know any easy way to convert all files in a folder into a dds-file? Irfanview can open dds, but not save dds-files, GIMP hasn't an easy to use batch-conversion-tool and the python-library pillow also can't save files as dds. BIMP for gimp also can't change file format to dds.

I know, but i replaced all bmp and tga-textures with black textures (with the same filename and filetype) and there is no change, as you can see in the screenshot above. Almost all textures should now be black, or am i missing something?

Ok, so i can't just remove textures from the game, i have to replace them with dummy textures if i want to change them one by one from the ground up? There is no way to simply remove the textures from the game? Edit: I replaced all bmp and tga files with completly black textures. The game looks still unchanged: https://i.imgur.com/oGiMfky.png

I don't understand how textures are stored and loaded at all. I want to replace the textures in Morrowind/Data Files/Textures one by one. I backed up all files and then deleted everything in the texture folder, but when i open the game, all textures are still there. Where are they coming from? Are they somehow stored together with the mesh data? I don't get how Morrowind is still able to load textures when there are no textures in the texture folder.