FileInfo.com


.ASMX File Extension


File Type Active Server Method File
File Format File
Common? No
File Description 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.
Program(s) that open asmx files Windows: Microsoft Visual Web Developer; Microsoft ASP.NET

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/asmx