"The page you are requesting cannot be served because of the extension configuration." error message

I'm getting this error message when trying to run my application. I don't know how to fix it:

HTTP Error 404.3 - Not Found The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.

Here's a screenshot of the error page:

What can I do to fix this error?

In Windows 8/10, you have to use

• Open Control Panel →
• Programs and Features →
• Turn Windows features on or off →
• Internet Information Services (IIS) →
• World Wide Web Services →
• Application Development Features →
• Check the appropriate items, such as enabling ASP.NET. (i.e install the appropriate version you want to configure your websites with)

Reference: Check the solution of this question for reference

Use aspnet_regiis.exe to register version of .NET framework you are using.

This is a common issue and happens when IIS is installed after VS or .NET framework.

Note - for Windows 8/10 users, see the other answer by JohnOpincar below. And also the comment/tip from Kevin Brydon.

I fixed that on my Windows 10:

1. Go to Control Panel - Programs and Features - Turn Windows features on or off.

2. Select .NET Framework 4.6 Advanced Services - WCF Services

3. Check HTTP Activation.

4. OK done.

In my case I needed to add MIME types for each file extension that I wanted to serve to web config:

<system.webServer>
    <staticContent>
      <mimeMap fileExtension=".shp" mimeType="application/octet-stream" />
      <mimeMap fileExtension=".dbf" mimeType="application/octet-stream" />
      <mimeMap fileExtension=".kml" mimeType="text/xml" />
    </staticContent>
    ...
</system.webServer>