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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
ASMX - Extension Details
Date Added: May 02, 2009
File Extension:  .ASMX
Description 1: .ASMX file extension is linked with Active Server Method File. This file identifies the web services that are called by an ASP or Active Server Page file. It is automatically compiled by ASP.NET if a service request is made. It can be accessed from the internet or from a local network. This file opens directly and it is a proprietary file format utilized by Microsoft.
File Type:   Internetrelated File
Mode: Binary
Program(s) to Open:  Windows: Windowsbased Web Sever with .NET framework
Common:
Extension: