Microsoft have produced some web parts which use Microsoft project  Central
and display various project information on the dashboard....

See www.microsoft.com/.../project.asp....

Provided the registry knows what the file  type is, the browser should
display the image accordingly. We use DXF files, and having installed a DXF
viewer, the image is displayed when the user clicks on the file. The same
applies to Word documents, Excel, and so on.
You could simply provide a web part that allows users to install the chart
viewer. Basically the browser needs to know what the filetype is. Now, it
may be possible to do all this server side using COM objects. This is the
better option from a solutions POV but will take you longer to implement.
Check the methods, objects of the DLL's installed with the package. You
could then call these from ASP web parts and display them within the portal.
I'm not too sure about this last bit but I'm sure you can do it.

Thanks for your quick response. Is there any SharePoint and Project 2000
Central demo that seamlessly work together? Does anyone know if Project
Central will be on the new Project 2002 version?

Project Central is going to be sold separately as "Microsoft Project
Server", also the traditional project  Suite will be split into
"Microsoft Project Standard" and "Microsoft Project Professional"

www.microsoft.com/.../default.htm