You can rename recovered_Xylon.capx to .zip again and open it in Windows Explorer (at least here). However many of the files seem to have gone missing. The file is 10mb smaller and most of the layout and project XML has disappeared. It seems to be permanently unrecoverable, except you may be recover some sounds and artwork from the recovered zip.
Now's probably a good time to use Construct 2's preferences to set up automatic backup. You could have had a day old backup to fall back to...
Can you remember what happened when it became corrupt? Did Construct 2 crash while you were doing something, your computer unexpectedly power off, etc?