I've downloaded and installed the Office PIA's (on my computer they go to C:\Windows\Assembly) and they appear in the Assembly. When I go to the properties of my project in the VS2005 IDE, click on the References tab and click on the ADD button, they don't show up in the .NET tab. Other items in the Assembly are there, but not the PIA's. I looked at the items starting with "I" and also starting with "Microsoft". Is there somewhere I can get the DLL's and place them in my custom assembly folder?