Developers often use the Keras Workshop or similar deep learning frameworks to handle these tasks.
If your goal is to extract features from images using a neural network (deep features), you would not use a game modding tool. Instead, you would typically use a library like or TensorFlow :
Use the Insert button to add a new texture slot to an existing archive.
Open a .txd file, select a texture, and use the Import button to replace it with a new .bmp , .tga , or .png file.
If you are trying to use txd_workshop.rar to change textures or add new visual elements to a mod, you are likely looking to or Export textures: