.ASMX File Extension
File TypeASP.NET Web Service File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is an ASMX file?
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.
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.