PakScape is made for opening .iwd files witch contains textures.
How to use:
1. Open PakScape
2. Press open and then on the side of "File name" choose all filetypes
3. Choose your .iwd file (You should make a backup of the .iwd files you are modding.)
4. Go in to images, and then take yout texture files and put them in the images folder.
5. Then press save and your done