.ASCX File Extension
ASP.NET User Control File
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What is an ASCX file?
An ASCX file is a webpage that can be used as a component of other webpages. For example, a navigation bar called navbar.ascx might be referenced by all pages within an ASP-driven website. A single change to the navbar.ascx file would then change the navigation bar on all the website's other pages.
Programs that open or reference ASCX files