Some web site uses hosted page as their home page. Most often, when typing the website URL in the address barthe URL changes and displays /index.html file extension.
Note: index.html is traditional filename which serves a general page, which is often referred to as a main or"index" page.
For example, A web site URL www.mynetsuitestore.com. Everytime a shopper types the URL on the address bar it redirects to www.mynetsuitestore.com/site/index.html
On the example given, index.html is a hosted page that serves as the home page of the Web Store and is currently saved on the File Cabinet under the directory /site.
To resolve this issue, ensure that the index.html is saved on the Root directory folder (On File Cabinet the root folder is Web Site Hosting Files > Live Hosting Files)