Navigate to the HTML file you wish to open and double-click it to you that file in your browser. Internet Explorer becomes your default browser when you install Windows.

If you use multiple browsers and need to open the .URL in a browser of your choice like Chrome, Edge, Firefox, etc., then this post will guide you on how you can achieve it.

How to Change the Way You Open Files in Google Chrome. The default applications your computer uses to open files can be changed if you prefer to use something other than what is currently set.

Type .html at the end of the file name and click on the Save button. This will save your text file in HTML format. Double-click on the saved file and it will open in your default web browser.

Google's latest 'blend online with offline' trick is automatically opening Google Drive files from the web with your desktop apps.