https://www.elderathome.com/wp-content/plugins/ill-file-icons/link-preview.js?ver=7.0.5

1addEvent(window, 'load', linkPreview);
2function addEvent(obj, evType, fn){
3	if( obj.addEventListener ) {
4		obj.addEventListener(evType, fn, false);
5		return true;
6	} else if( obj.attachEvent ) {
7		var r = obj.attachEvent("on"+evType, fn);
8		return r;
9	} else {
10		return false;
11	}
12}
13function linkPreview(){
14	var links = document.getElementsByTagName("a");
15	for( i=0; i<links.length; i++ ){
16		var currentLink = links[i];
17		var images = currentLink.getElementsByTagName("img");
18		if( images.length == 0 ) {
19			var linkHref = currentLink.href;
20			if( linkHref.match(/amazon.com/) ) {
21				append(currentLink, "amazon");
22			} else {
23				checkLinks(linkHref, currentLink);
24			}
25		}
26	}
27}
28function checkLinks(linkHref, currentLink){
29	var linkHrefParts = linkHref.split(".");
30	var extension = linkHrefParts[linkHrefParts.length - 1];
31	extension = extension.replace("/","");
32	if( extension in { doc:1, docx:1, mp3:1, pdf:1, ppt:1, txt:1, wmv:1, xml:1, xls:1, xlsx:1, zip:1 } ){
33		append(currentLink, extension );
34	}
35}
36function append(currentLink, extension){
37	var span = document.createElement('span');
38	span.innerHTML = "&nbsp;";
39	currentLink.parentNode.insertBefore(span,currentLink.nextSibling);
40	span.className = extension;
41}