set default file when navigating to sub folder

I am used to develop joomla sites and host in CLOUDLINUX. So home directory by default redirect to index.php page. Recently I developed a pure HTML site. For testing purposes I used my CLOUD LINUX server. It can read index.html as the default folder file.
In this project customer gave his windows server. Surprisingly it did not read index.html page. But it identifies home.htm page. So I did little change in my structure to priorities home.htm.