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Registry: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders

The values under HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders can be used to redirect user profile folders (aka user shell folders) to non-default paths.
Registry value User shell folder that is redirected
AppData Application Data
Desktop Desktop
Fonts Fonts
Local Settings Local Settings
Personal My Documents
My Pictures My Pictures
NetHood Network Neighorhood
PrintHood Print Neighorhood
Programs Programs Group
Recent Recent
SendTo Send To
Start Menu Start Menu
StartUp Startup Group
Templates Templates
My Video (?) ?
My Pictures (?) ?
My Music (?) ?
Cache (?) ?
Cookies (?) ?. Cookies folder cannot be redirected to a Universal Naming Convention (UNC) path - only to a local path or a mapped drive.

See also

The values under this registry key seem to be related to the System.Environment+SpecialFolder enumeration.
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
%USERPROFILE%

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