Antivirus API

As has been described in MSDN , The Antivirus API enables software vendors to develop applications that scan Microsoft® Office 2000 documents before opening them.
So this API enables the independent software vendors (ISVs) to design and implement scanning software that can be used by all applications.
One of the scanning software interfaces should be "IOfficeAntiVirus" with a method named "Scan" .

How can i implement the "IOfficeAntiVirus" interface in my object ? or maybe the interface of my object should be inherited from this interface ?
Any source code or URL will be appreciated...