User Shell Folders
The User Shell Folders subkey stores the paths to Windows Explorer folders for the current user of the computer.
The entries in this subkey can appear in both the Shell Folders subkey and the User Shell Folders and in both HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER. The entries that appear in user User Shell Folders take precedence over those in Shell Folders. The entries that appear in HKEY_CURRENT_USER take precedence over those in HKEY_LOCAL_MACHINE.
Shell Folders in HKEY_CURRENT_USER
Shell Folders in HKLM
User Shell Folders in HKLM