It's all cut up in individual pieces. For example, the window is 9 pieces (for each corner and middle), Each piece is 16x16 pixels
I don't know how they could be "complete" as there's no set size for the windows
If you want to you can check out the contents of the pack in this other store I use: link (click the "files" tab, also the website is a bit weird and not loading some times)