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.ASMX File Extension

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File TypeASP.NET Web Service File

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CategoryWeb Files


File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.


Defines Web services called by an Active Server Page (.ASP file); automatically compiled by ASP.NET when a request to the service is made; can be accessed over the Internet or from a local network.

More Information

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.

Program(s) that open .ASMX files
Microsoft Windows LogoWindows
Microsoft Visual Web Developer
Microsoft Visual Studio 2013
Updated 5/25/2009