.ASMX File

.asmx is ASP.NET Web Service File

Key Features: .ASMX File Extension

Features Description
File Extension .asmx
Format N/A
Created by Microsoft
Category Web

What's on this Page

  1. How to open:
  2. How to convert:

What is an .ASMX file?

The asmx file extension is associated with Microsoft Active Server Plus.

The asmx files are used for source files, which define web services called by an Active Server Page file (asp file extension) and are automatically compiled by ASP.NET when a request to the service is made. It can be accessed over the Internet or from a local network.

The asmx files begin with the ASP.NET directive "WebService," followed by the "Language" parameter. This is used to set the programming language to Visual Basic, C#, or JScript. They can be run using a Windows-based Web server with the .NET framework.

An asmx file extension is related to the Active Server Plus Web Services. An asmx file stores source data.

How to open:

Use any text editor or specialised application able to work with the asmx files, or use any internet browser to view the page.

How to convert:

Probably cannot be converted to other formats.
ASP.NET Web Service File - File openers


  1. Microsoft Visual Web Developer
  2. Microsoft Visual Studio 2017




How to solve problems with ASMX files