Hmmm, it's only 21 kb file, but Windows Explorer show it as an invalid file. Do you have any backups of it, from before the problem happened?
Edit
I tried to look at it in a simple text editor (Notepad) but it looks like some kind of traditional Asian characters or heiroglyphics. I tried Notepad++, but that show other kind of bizarre looking codes.
In any case, that file is completely corrupt. I don't know as much about this as Lazur, but I don't think the file can be saved. So hopefully you have a backup?