What is an ASPX file?

This article explains what ASPX files are and how to use them, what to do if you download one by mistake, and how to convert one to a more useful format.

What is an ASPX file?

A file with the ASPX extension is an Active Server Page Extended file designed for the Microsoft ASP.NET framework. Also called .NET web form. Although they look very similar, ASPX files are not the same as Web Handler files that end in ASHX.

A web server generates these files, which contain scripts and source code to tell the browser how to open and display a web page.

Very often, you probably only see this extension in a URL or when your web browser accidentally sends you an ASPX file instead of the one you thought you were downloading.

If you downloaded an ASPX file and expected it to contain information (such as a document or other saved data), something is likely to be wrong with the website, and instead of generating usable information, you provided this server-side file .

In this case, the trick is to rename it as you expect. For example, if you were expecting to receive a PDF version of an invoice from your online bank account, but instead received a file with this extension, rename it to bill.pdf and open it. . If you were expecting an image, try renaming the file to image.jpg. You know what I mean.

Rename an ASPX file to PDF.

To be able to rename a file extension, your computer must be configured to display the file extension. To do this, open the Run (WIN + R) dialog box and enter the control folders. Use the View menu to locate the Hide extensions for known file types: Uncheck the box and apply the changes.

The problem is that sometimes the server (the web that provides you with the ASPX file) does not properly name the generated file (PDF, image, music file, etc.) and does not present it for download. as it should be. Just do this last step manually.

You can’t always change the extension of a file for something else and expect it to work in the new format. The case of a PDF file and the ASPX file extension is very special, because it is simply a naming error that you are correcting.

Sometimes the cause of this problem is related to the browser or plugin, so you may be lucky enough to load the page that generates the ASPX file from a different browser than the one you are currently using. For example, if you’re using Internet Explorer, try switching to Chrome or Firefox.

If you see a URL with ASPX at the end, like the one from Microsoft, it means that the webpage is running in the ASP.NET framework:

You don’t need to do anything to open this type of file because your browser does it for you, whether it’s Chrome, Firefox, Edge, etc.

When the browser displays the page, it looks completely normal; The following is how the source code looks at the back of the page in this example:

ASPX text example.

The actual code in the ASPX file is processed by the web server and can be encoded in any program that encodes ASP.NET. Microsoft Visual Studio is a free program that you can use to open and edit these files. Another tool, though not free, is the popular Adobe Dreamweaver. Sometimes you can view an ASPX file and edit its contents with one of the free text file editors.

Many URLs end in default.aspx because this file serves as the default webpage for Microsoft IIS servers (that is, the page that opens when a user requests the site’s root webpage). However, an administrator can replace it with another file.

ASPX files have a specific purpose. Unlike images, such as PNG, JPG, GIF, etc., where a file conversion helps maintain compatibility with most image editors and viewers, ASPX files will stop doing what they are supposed to. they should do this if you convert them to other file formats.

If you convert them to HTML, for example, the HTML result will certainly look like on the ASPX webpage. However, because items in ASPX files are processed on a server, you cannot use them properly if they exist as HTML, PDF, JPG, or any file you convert them to your computer.

However, since there are programs that use ASPX files, you can save one in another format if you open it in a suitable editor. Visual Studio, for example, can save ASPX files such as HTM, HTML, ASP, WSF, VBS, ASMX, MSGX, SVC, SRF, JS, and more.

Still can’t open it?

Be careful not to confuse other filenames with similar names with an extension ending in .ASPX.

For example, ASX files appear to be related to ASPX files, but they could actually be temporary index files in the Alpha Five library that only work in the context of the Alpha Anywhere platform. The same goes for other files like ASCX.

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