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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
OPML - Extension Details
Date Added: January 01, 1970
File Extension:  .OPML
Description 1: File extension .OPML stands for Outline Processor Markup Language. It is an outline document that is written in OPML and used to swap Web feeds lists like RSS files between website feed aggregators. OPML files are also utilized for other forms of outlining. Every .OPML file includes these XML elements: head containing metadata describing the content; outline containing a line in the outline, opml version as in "1.0; and body featuring the outline content.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Windows: ConceptDraw MINDMAP, Natara Bonsai, Scripting News OPML Editor, Tkoutline Macintosh: Circus Ponies NoteBook, ConceptDraw MINDMAP, Scripting News OPML Editor, The Omni Group Omni Outliner, Tkoutline
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