The ASMX extension indicates a Microsoft Active Server Plus (ASP) file. These are source files which define Web Services called by an Active Server Page file. They are immediately compiled by ASP.NET if a request to the server is issued and can be accessed through local networks or over the Internet.
ASMX are XML based files and always start with the "@ WebService" directive which is used to correlate the URL (Uniform Resource Locator) address of the Web Service with its implementation. This is followed by the "Language" parameter which is needed to set the programming language to JScript, C# or Visual Basic.
How to open ASMX Files
Just like any XML based file, ASMX files can be opened with any text editor. They can also be opened with any major web browser and the applications below.
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