Automatically save an attachment

We use outlook 2000 in our office.
I'd like to find out how to automatically save an attachment (a Word .doc
file) when it comes in with specific conditions (from person X with Y in the
subject line, etc...). Right now, I have the messages that meet the
aforementioned criteria being saved to an outlook folder, but I also want to
automatically save the .doc attachment to a specific folder under "my
documents" for future use.

Ideas??

Thanks!