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Hi. I was able to extract a file from Batman - TEW - TTS - Shadows Edition. And delivered me a d3dtx file. I want to know how to extract this file in d3dtx format and after changing it to my liking. Add it back to the game.

Just use TTG Tools.
https://github.com/pashok6798/TTG_Tools

And please use search function before asking any questions.
This issue has been discussed here before.
https://i.imgur.com/VGGE0gA.png