The File Extensions Database

.ASPX File Extension

  • Developer by: Microsoft
  • Category: Web Files
  • Format: Text

What is an .ASPX file?

.ASPX is Active Server Page Extended File

An ASPX file is a server-generated web page that may contain VBScript or C# code. It is often written with Microsoft Visual Web Developer and designed for the Microsoft ASP.NET framework. ASPX files contain scripts that are processed on the web server and the resulting HTML is sent to the user's web browser.

ASPX pages are also called ".NET Web forms." They can be identified in a web browser when the URL in the address field ends in ".aspx".

Common ASPX Filenames

Default.aspx - The default webpage loaded when a client browser requests a Web server directory on a Microsoft IIS-based server that uses ASP.NET. For example, when a client requests, the server loads, unless it is configured to load a different file.

Programs that open Active Server Page Extended File
File Viewer Plus
Microsoft Visual Web Developer
Microsoft Visual Studio 2017
ES-Computing EditPlus

How to solve problems with ASPX files

  • Associate the ASPX file extension with the correct application. On :
    Windows: Right click on any ASPX file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.ASPX files". Mac: Right click (or Ctrl-click) the ASPX 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 .ASPX is Active Server Page Extended File. Because only the current version supports the latest ASPX file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available .ASPX is Active Server Page Extended File update.
  • To make sure that your ASPX file is not corrupted or virus-infected, get the file again and scan it with antivirus software.