The system uses this registry value to complete the move operation at restart. When the MoveFileEx() call succeeds, this registry value is created. For the MOVEFILE_DELAY_UNTIL_REBOOT flag, the calling process needs to be in the context of a user who belongs to the administrator group or the LocalSystem account. By default, only Administrators and LocalSystem have write access to the
registry key where the PendingFileRenameOperations value is created.
If the destination file or directory already exists and has to be replaced, the MOVEFILE_REPLACE_EXISTING flag also needs to be specified along with the MOVEFILE_DELAY_UNTIL_REBOOT flag when MoveFileEx() is called. Otherwise, the move operation fails without any error message when the system is restarted.
If the source file or directory is on an NTFS drive, the LocalSystem account or Administrators needs to have delete access permission on the source for the move operation to succeed.
If all these conditions are met, the system will move the source file or directory successfully at restart when the session manager is initialized.