ASP.net need to access MS Office file properties

[Guest]

Hi,

I need to access the file properties from a Word or Excel document.
When a user authors a document and clicks File-->Properties, he/she
can fill out addition information.

I need to access this information from an ASP.net page that
lists documents in a directory; I would like to display more detail
from these properteis.

In what version of office can I find the .dll. I don't see
it in my Office 2000 Pro.

Thanks,

Do