File Extension ASCX

  • Full name
    Active Server Pages Web User Control Format
  • Developer
  • Popularity
Have you encountered a problem with a ASCX file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a ASCX file here. In the further part of this page we have added a list of programs that should open your ASCX file. It is enough you choose a proper application for your operating system, download and install it.


The file extension ASCX identifies ASP.Net user controls. It is reusable code that can be accessed in ASP.Net web pages. Ascx files are simple text files that can contain ASP.Net code as well as functions in .Net languages like C # and Visual Basic.

Alternatively, a C # or Visual Basic file is referenced in an ASCX file, which provides the functionalities, while the ASCX file contains only the ASP.Net code for the web page elements. The referenced files usually have a double ending like ascx.Cs or ascx.Vb.

By default, the .Net framework also provides ASCX files, such as a user login or an input field, which can be used with Visual Studio, for example.

Please note that for newer versions of Adobe Dreamweaver the extension 'ASPNet_Support.Mxp' found in the Dreamweaver program folder under 'configurationDisabledFeatures' has to be installed first.

Programs which can open a ASCX file

How to open a ASCX file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the ASCX file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a ASCX file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support ASCX files. At this point we are looking for disk space where the application was installed in and we can link it with a ASCX file. Since then, our operating system will use the selected program to support all ASCX files.

Other issues

Despite the described problem with ASCX there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the ASCX file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the ASCX file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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