Operating system: Windows 8.1.
Graphics card: Nvidia GTX 1060 3GB
Blender Version 2.79 and 2.8
Files disappeared after closing blender
Two versions of Blender 2.79 and 2.8.
Open file created in Blender 2.8. in Blender 2.79
Close wrong blender. Python console not closed instantly. Hit the close button of console.
Open right one Blender and try reopen that file.
Then find out your whole folder with blend files is gone.