Refresh Your PC Without Affecting Your Files option

The Refresh Your PC Without Affecting Your Files option changes all settings back to their defaults while retaining data files, personalization settings, and apps installed from the Windows Store. Files in the user’s profile (except those in the AppData folder) are preserved, as are any folders created in the root of the system drive and on other partitions. All user-installed desktop programs and Windows

Store apps are removed, and a list of removed programs is saved on the desktop. 
CHAPTER 9         Backup and recovery options in Windows 10         93
The Refresh Your PC option boots into Windows RE and gathers user accounts, settings, data, and Windows Store apps. It then uses the next-to-last system rollup to create a new, clean instance of the following folders, including all subfolders: \Windows \ProgramData \Program Files \Program Files (x86)  %UserProfile%\AppData  Any apps and settings created as part of the original OEM image are restored from the customization container for those changes. After a reboot, the saved settings, data files, and apps are applied to the new operating system. This process can take several minutes to complete.  In Windows 8.1, the Refresh Your PC option required a significant amount of free disk space to function—Microsoft has not yet published guidance on how much disk space will be required as a result of the changes in Windows 10.