AGH Viewer [right click, save as]
You probably need These DX Files (put them in the folder with the exe if needed)
This is the GUI driven C# adaptation of my old command line agh2dds program. It converts to tga by default, which is a more common format than DDS, and the game will convert TGA back to AGH automatically. It will view almost any texture type in the game, but non-power-of-two textures get distorted tofit. So be aware of this if you're wanting to use it to nake texture mods.
Feel free to ask questions, or request features. I haven't looked at the code since Jan 2006 though, so any updates may take a while.