>> ASMX file

ASMX file format description

Many people share .asmx files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .asmx file can be edited, converted or printed with. On this page, we try to provide assistance for handling .asmx files.

1 filename extension(s) found in our database.

.asmx - ASP.NET Web Service

The ASMX development files are related to Visual Studio - Visual Web Developer. The ASMX file is an ASP.NET Web Service. ASMX file contains the WebService directive, which identifies the public class that implements the Web service logic. ASP.NET was first released in January 2002 with version 1.0 of the .NET Framework, and is the successor to Microsoft's Active Server Pages (ASP) technology. (ASP is the server-side execution environment in Microsoft Internet Information Server that enables you to run scripts on the server.)

Visual Studio - Visual Web Developer
Development files
- / -
ASP.NET Web Service related extensions:
Unix Shared Library
Juniper SLAX Script
WinDev Request Data
Xdebug Trace Output
IBM AIX System Data
ARM RealView Compiler Object

Naturally, other applications may also use the .asmx file extension. Even harmful programs can create .asmx files. Be especially cautious with .asmx files coming from an unknown source!

Can't open a .asmx file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .asmx file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

amx, ashx, asm, asx, smx

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

SysMetrix Skin
Adobe Motion Exchange Video
Alphacam Stone Param Macro
AMX Mod Plugin

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android

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