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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
EML - Extension Details
Date Added: February 04, 2009
File Extension:  .EML
Description 1: .EML file extension is linked with Outlook Express Saved Email Message. This is the email messaged that was saved using MS Outlook or other email application. EML is short for electronic mail. It may contain an attachment or a file. .EML files may be opened via Internet Explorer since both are formatted like .MHT files. Users can change the .EML file extension to .MHT in order to open the file directly in Internet Explorer.
File Type:   Internetrelated File
Mode: Binary
Program(s) to Open:  Windows: IncrediMail, Microsoft Internet Explorer, Microsoft Outlook or Outlook Express; Mac: Apple Mail, Microsoft Entourage
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