.ASCX File Extension
File TypeASP.NET User Control File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is an ASCX file?
Web page that can be used as a component by other Web pages; for example, a navigation bar called "navbar.ascx" might be referenced by all pages within a ASP-driven website; a single change to the navbar.ascx file will change the navigation bar in all the other pages.