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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
YML - Extension Details
Date Added: April 09, 2008
File Extension:  .YML
Description 1: .YML is the file extension linked with Ruby on Rails Database Configuration File. Rails refers to a fullstack framework for databasebacked web applications development that satisfies the ModelViewControl pattern. Ruby codes are embedded into text files using eRuby language. For instance, it is possible to embed Ruby codes into HTML files.
Description 2: YML is short for "YAML Aint Markup Language. It is the humanreadable format that is used for sorting and organizing data included in a text file. Different programming languages can be utilized with the .YML extension format, like Python, Ruby, Perl and JavaScript. Ruby on Rails uses .YML to hook up to a database, usually with the name "database.yml.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Mac and Windows: Any text editor
Common:
Extension: