Wallpaper

Please explain a little more of what it is your trying to do.

What type of theme are you talking about? windowblinds, desktop x?

What are you trying to change? Back ground, wb image?

The more info you put in the more you get back.

I assume the skin is for windowblinds. Then you need Skin Studio to alter it or create a new part.

Now, since your topic said wallpaper, I assume you want to have a wallpaper loaded with the windowblind skin. Then, you need to go to the personality section of skin studio, and import the image(wallpaper), to the desktop wallpaper section. Make sure you only import bmp files. Then, you need to make sure that you have the option checked to "Apply any wallpaper supplied" checked, in the windowblinds settings(through display properties), and reload the skin. The wallpaper will now automatically load with the skin.

If you don't use skin studio, you could edit the .uis file in notepad, if it's a .uis2 skin. Just add the wallpaper file (e.g. mywall.bmp) to the skin folder, then open the .uis file in notepad. At the end of the [Personality] section, add a new line

Wallpaper=mywall.bmp

Save the file and reload the skin.