I had this same issue on my thread "Ghost Saves".
I wanted to port over my files (which you can do with v20. yes, you can port over your v19 stuff.) but since I was on a Windows 7, nothing appeared in Program Files.
I looked up "Virtual Store" after help from Badspot, and it turns out everything was THERE - in a hidden folder.
Keep that in mind if you're on a Win7/Vista, you want to port over your 3+ yr files, and can't find them.