ASMX file format description

Many people often share .asmx files without providing instructions on how to use them. This can make it difficult for users to determine which program is compatible for editing, converting, or printing .asmx files. To address this issue, we have created this page to offer assistance and guidance on handling .asmx files. We provide information on compatible software, editing instructions and conversion options to help users effectively interact with .asmx files.

Our aim is to simplify the process and promote seamless use of the .asmx file format.

1 filename extension(s) found in our database.

.asmx - ASP.NET Web Service

The ASMX development files are related to Visual Studio - Visual Web Developer. The ASMX file is an ASP.NET Web Service. ASMX file contains the WebService directive, which identifies the public class that implements the Web service logic. ASP.NET was first released in January 2002 with version 1.0 of the .NET Framework, and is the successor to Microsoft's Active Server Pages (ASP) technology. (ASP is the server-side execution environment in Microsoft Internet Information Server that enables you to run scripts on the server.)

Application:Visual Studio - Visual Web Developer
Category:Development files
Magic:- / -

ASP.NET Web Service related extensions:

  • wdr WinDev Request Data
  • axf ARM RealView Compiler Object
  • ts0 tio32 Script
  • gcov GNU GCOV Logfile
  • vcwin32 Visual Studio Visual C Win32 Makefile
  • scro Amira Script Object

Be careful.

It is important to understand that the .asmx file extension is not limited to a particular set of applications. Other programs besides the intended ones can also use the .asmx extension to create files. This includes potentially harmful programs or malware that may generate .asmx files for various purposes. Be especially cautious with .asmx files coming from untrusted or unknown sources.

Can't open a .asmx file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize an extension, you receive the following message:

Select an app to open this .asmx file

To set the .asmx file association in Windows 11, you can follow these steps

  1. Open the Settings app by clicking on the Start menu and selecting the gear icon.
  2. In the Settings app, click on System and then select Apps from the left-hand side menu.
  3. Scroll down and click on the Default apps option.
  4. Under the Default apps section, you will find various categories such as Email, Web browser, and Music player.
  5. Locate the category that matches the file type you want to associate, such as Photos for image files or Video player for video files.
  6. Click on the current default app listed under the category. A list of available apps will appear.
  7. Choose the app you want to set as the default for that file type. If the desired app is not listed, click on More apps to see additional options or click on Look for an app in the Microsoft Store to search for apps in the Store.
  8. After selecting the app, it will become the default choice for opening files of that type.

It's worth mentioning that you don't always need to set .asmx file association. Many applications can open .asmx files without requiring any specific file association to be set.

The .asmx file extension is often given incorrectly

Based on searches conducted on our site in the past year, we have compiled a list of the most common misspellings. These frequent misspellings can cause confusion and hinder search accuracy. Our goal in providing this list is to help users find the right information more easily and enhance their overall search experience on our website.

These misspellings were the most common in the past year:

amx, ashx, asm, asx, smx

Is it possible that the filename extension is misspelled?

There is a possibility that the .asmx filename extension is misspelled. To assist users in identifying potential errors, we provide a list of similar file extensions in our database.

Filename extensions similar to .asmx:

Operating systems

At, we strive to provide a seamless user experience by ensuring compatibility with a wide range of operating systems. The following is a comprehensive list of the operating systems currently supported by

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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The verification conducted by the team ensures that the information presented is accurate, reliable, and thoroughly researched. Users can rely on as a trusted source of information, knowing that their team's dedication to verification and quality control provides a dependable resource for staying informed. is not liable for the content and accuracy of external links, even if we exercise careful control over them.

If you find the information on this .asmx page useful, please feel free to link to this page. >> ASMX file