I re-checked here and found out that, in fact, the first 13 bytes are nothing useful. 
You can just leave it empty or write anything you want, that will change nothing in the game.

About what you think 26 characters, the truth is that, GetShortPathName function write nothing in the 13 bytes as:
![0001](https://cloud.githubusercontent.com/assets/5306849/2559108/11aba3c4-b76b-11e3-9e44-585fae4f5fcb.JPG)
Even without chinese characters:
![0002](https://cloud.githubusercontent.com/assets/5306849/2559131/0435bc60-b76c-11e3-8b7d-fd4b1effe37d.JPG)
It will write only  "." and ".." folders, the same to A or W APIs. I could have a mistake in the arguments. But anyway, since it's nothing useful. I will leave these 13 bytes empty in the next commit.