First, this has nothing to do with MS Office. It is your operating
system that provides these features. To sort of do what you want you
will need to change how your operating system shows you files. You would
need your system to support "Web view" of folders. That feature was
specifically disabled due to the vulnerabilities of automatically
running HTML content on the desktop. If you really insist on doing this,
then you will need to be prepared make some additions to support it and
then you can make the directory be a web page and then add comments. I
don't recommend it, but if you insist start here, at the XP section
http://windowsxp.mvps.org/Customize_folder.htm
and further instructions can be found here
http://technet.microsoft.com/en-us/library/bb727004.aspx
any further questions should be posted to the group for your operating
system, presumably Windows XP