This page will help you get started with rollMyFile JavaScript API to open hundreds of different file types on the Web.
Using rollMyFile API in JavaScript
On a page, where you want to let users open files, you simply do the following
<script type="text/javascript" src="https://api.rollapp.com/2/js/rollmyfile.js"></script>
<script type="text/javascript">
var key = "SeCur3AP1K3y";
var rollMyFile = new RollMyFile(key);
</script>
And then all it takes to open a file is
rollMyFile.openFileByUrl("https://www.example.com/documentation/overview.docx");