The MSDN says that using ReadDirectoryChangesW implies the calling process having the Backup and Restore priviliges.

Does this mean that only process launched under administrator account will work correctly? I've tried the following code, it fails to enable the required privileges when running as a restricted user.

        void enablePrivileges() 
        {               
            enablePrivilege(SE_BACKUP_NAME);
            enablePrivilege(SE_RESTORE_NAME);
        }

        void enablePrivilege(LPCTSTR name) 
        {               
            HANDLE hToken;    
            DWORD status;
            if (::OpenProcessToken(::GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &hToken))    
            {        
                TOKEN_PRIVILEGES tp = { 1 };   
                if( ::LookupPrivilegeValue(NULL, name,  &tp.Privileges[0].Luid) )
                {
                    tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
                    BOOL result = ::AdjustTokenPrivileges(hToken, FALSE, &tp, 0, NULL, NULL);
                    verify (result != FALSE);
                    status = ::GetLastError();                      
                }
                ::CloseHandle(hToken);  
            }   
        }

Am I doing something wrong? Is there any workaround for using ReadDirectoryChangesW from a non-administrator user account? It seems that the .NET's FileSystemWatcher can do this. Thanks!