This tool is used to enable & disable the auto mount feature of windows. It also has a scrub feature to remove the previous drive letters assigned to drives no longer hooked to the system.
Example: Running Windows 2003 I plug in a external hard drive for backups. Windows 2003 does not assign a drive letter to the new drive since it is disabled by default in 2003. With this tool I now have 2003 giving drive letters to each new external drive I hook to the system.