Internet Information Services (IIS) 7 and later use an XML-based configuration system for storing IIS settings.

# IIS Config File Paths

Internet Information Services (IIS) 7 and later use an XML-based configuration
system for storing IIS settings which replaces the metabase that was used in IIS
6.0 and earlier. This new configuration system was introduced with ASP.NET and
is based on a hierarchical system of management system that uses \*.config
files. The configuration files for IIS 7 and later are located in the
`%windir%\System32\inetsrv\config` folder.

## applicationHost.config

This configuration file stores the settings for all your Web sites and
applications.

    %windir%\System32\inetsrv\config\applicationHost.config

## administration.config

This configuration file stores the settings for IIS management. These settings
include the list of management modules that are installed for the IIS Manager
tool, as well as configuration settings for management modules.

    %windir%\System32\inetsrv\config\administration.config

## redirection.config

IIS 7 and later support the management of several IIS servers from a single,
centralized configuration file. This configuration file contains the settings
that indicate the location where the centralized configuration files are stored.

    %windir%\System32\inetsrv\config\redirection.config

> Source: [IIS Configuration Reference](https://docs.microsoft.com/en-us/iis/configuration/)