AstralLein
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.dds or .tga, it doesn't matter.
.xdb is located in the same folder as the textures and has a similar (or identical) name. You need to open it with Notepad. Inside, there is a line without a path (the second one, I think) with the name of the texture file (it should be in the same folder as the .xdb file so that the game can see it).
Then, you specify the path to this .xdb file.
Added after 56 seconds
It is important to note that the .xdb extension is used not only for texture files but also for half of the other files.
.xdb is located in the same folder as the textures and has a similar (or identical) name. You need to open it with Notepad. Inside, there is a line without a path (the second one, I think) with the name of the texture file (it should be in the same folder as the .xdb file so that the game can see it).
Then, you specify the path to this .xdb file.
Added after 56 seconds
It is important to note that the .xdb extension is used not only for texture files but also for half of the other files.