addition extension setup in IIS7 for asp project

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IIS6

IIS7

IIS

Hi friends.
I am working on one website which is already built in asp and setup in IIS6 on WIN2003 server. Now it needs to upgrade into ASP.NET4.0, WIN2008 and IIS7.

But before upgrading, We need to setup existing asp website in IIS7.

I have following issue to setup existing website in IIS7.

1. Additional extension setup.
- http://www.naepc.org/about.web[^]
This website currently running in existing server on IIS6. If you see, Page name extension is ".web" but I am not getting any way to work this extension in IIS7.

Can anyone know me how to be worked this additional extension in IIS7.

Thanks
Imrankhan