ASMX file: How to open? The best software for opening asmx files

ASMX

Active Server Plus Web Services source data

File type: Source code and script file, Internet related file

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

What is asmx file?

File type category:
Source code and script file
Internet related file

Date updated: June 27, 2025

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 asp (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.

How to open asmx file?

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 asmx file?

Probably cannot be converted to other formats.

Suggested software to open asmx file:

Associated software actions with the asmx file