What is an ascx file and how do I open an ascx file?
ASCX is a 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.
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Detail ascx file extension information:
File Format: ASP.NET User Control File
Primary Association: ASP Files
Relevant ascx file links:How to open ascx file on Youtube
How to open ascx file on Wikipedia
How to open ascx file on Microsoft.com