The File Extensions Database

.ASCX File Extension

  • Developer by: Microsoft
  • Category: Web Files

What is an .ASCX file?

.ASCX is ASP.NET User Control 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.

Programs that open ASP.NET User Control File
Microsoft Visual Studio 2017
Microsoft Visual Web Developer
Adobe Dreamweaver CC 2019
Adobe Dreamweaver CC 2019
MacroMates TextMate

How to solve problems with ASCX files

  • Associate the ASCX file extension with the correct application. On :
    Windows: Right click on any ASCX file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.ASCX files". Mac: Right click (or Ctrl-click) the ASCX file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .ASCX is ASP.NET User Control File. Because only the current version supports the latest ASCX file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available .ASCX is ASP.NET User Control File update.
  • To make sure that your ASCX file is not corrupted or virus-infected, get the file again and scan it with antivirus software.