If you want to have some cool tools for handling the Arch & Design material in Max 9 (including converting other materials - including vRay materials - into Arch & Design) you can use this script.
Save the file to your 3dsmax/scripts folder, and run it from the "MaxScript" menu.
Then go into the "Customize" menu and choose "Customize User Interface".
Go to "Menus", and on the left side open up the "mental ray" category.
On the right side, open up, say, the "Tools" menu (or any other of your choice).
Drag-and-Drop the "mr Arch Design Tools" to some cool place on that menu.
Voila - you have installed this nifty little add-on.
Note: A much simpler version of this script exists on the max 9 DVD in the sample scripts folder, but this variant is updated.