Use this tab to customize Web service extensions such as ASP, PHP, PERL and etc.. By default, in order to take a more proactive stance against malicious users and attackers, IIS serves only static content - meaning features like ASP, ASP.NET, etc. do not work unless enabled. If you do not enable this functionality after installing IIS, IIS returns a 404 error.

1 ) Open Web Site Properties page

2 ) Select Extension Tab 

3 ) Select required extensions to enable 

4 )  Click Update button.

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