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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
MAILHOST - Extension Details
Date Added: January 01, 1970
File Extension:  .MAILHOST
Description 1: .MAILHOST is linked with MSN Mailhost Settings File. This file stores the preferences for MSN email server. This file is installed together with the MSN program and it is required by MSN to send and check emails. It is usually named "MSN#.mailhost. MSN program displays an error message when the Mailhost file is missing or corrupt: "Mailhost File error. This error can be recovered by selecting "Run from Windows "Start Menu. Type the command on the text box as follows: regsvr32 c:progra~1msnmsncorefilesmailui.dll. This command restores the Mailhost file and allows the program to communicate with the MSN email server again.
File Type:   Settings File
Mode: Binary
Program(s) to Open:  Windows: Microsoft MSN software
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Extension: