Files with the HTC extension are associated with websites that operate mainly in Microsoft browsers. HTC are files that store additional components for HTML files that allow for dynamic behavior of specific elements on the page. From a technical point of view, these are plain text files containing scripts that can be used multiple times in various website designs. Often such files appear as modules in the design of web applications with dynamic content.

Internet Explorer 10 in standard mode does not support HTC files and then updates them to JS files (JavaScript files).