How to extract wallpaper from theme pack

As i only post theme for windows 7, i think maybe some of you will feel that my theme compilation is not good enough and want to make on your own. At the same time, you want to use few of the wallpapers within my themes. Then the problem is how can you extract the wallpaper from .themepack files. Let me show you here, it just as simple as extracting a zip file =)

1. Locate your file and right click it, then click "Open with"
2. Then proceed to "Choose default program"

3. After that, you should see something like below, just choose winrar and open it. If winrar is not in the list, use "browse" to find your winrar.exe and click ok.

4. Now you in winrar, just extract it to anyplace you like and you get the wallpaper. DONE!