RTF is a global modification that replaces all towns in the game.

[/U]the problem is that I don't know how to extract the textures, because they are in .orc archives (if I'm not mistaken) and they can't be opened with a simple WinRAR

You can extract them with a simple 3D ripper. If you really need them and are too lazy, I can do it. Just keep in mind that there won't be a T-pose.[/QUOTE]
No, I don't work with mods (I lack the necessary skills and knowledge), but I understand the gist (what can be done and what can't).
If you need textures or characters, I can tell you where to find them and which specific character it is, down to the paths (if the archives can be opened)

Added after 1 hour 8 minutes
when I messed up with the quotes.