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#50
The folder flags are located in the following keys :
[HKCU\SOFTWARE\Classes\Local Settings\SOFTWARE\Microsoft\Windows\Shell\Bags\AllFolders\Shell\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}]
[HKCU\SOFTWARE\Classes\Local Settings\SOFTWARE\Microsoft\Windows\Shell\Bags\AllFolders\Shell\{7d49d726-3c21-4f05-99aa-fdc2c9474656}]
[HKCU\SOFTWARE\Classes\Local Settings\SOFTWARE\Microsoft\Windows\Shell\Bags\AllFolders\Shell\{94d6ddcc-4a68-4175-a374-bd584a510b78}]
[HKCU\SOFTWARE\Classes\Local Settings\SOFTWARE\Microsoft\Windows\Shell\Bags\AllFolders\Shell\{b3690e58-e961-423b-b687-386ebfd83239}]
[HKCU\SOFTWARE\Classes\Local Settings\SOFTWARE\Microsoft\Windows\Shell\Bags\AllFolders\Shell\{5fa96407-7e77-483c-ac93-691d05850de8}]
The concerned DWORD value is : FFLAGS
You can refer to the MSDN for the FOLDERFLAGS enumeration:
FOLDERFLAGS enumeration (Windows)