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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
ASPX - Extension Details
Date Added: January 01, 1970
File Extension:  .ASPX
Description 1: .ASPX file extension is linked with ASP.NET Script Page. Dynamic web pages and websites are created by using the dynamics of Microsoft ASP.NET script. ASP.NET server helps build web applications easier. It enables HMTLlike declarative programming that allows users to build web pages with less code. ASP.NET web pages can work in all browsers such as Opera, Internet Explorer, Firefox and Safari.
File Type:   Source Code & Script
Mode: ASCII
Program(s) to Open:  Windows: ASP.NET
Common:
Extension: