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File extension

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Definition Edit

A file extension (also filename extension or file name extension) is "[a] period and one or more letters at the end of a filename intended to indicate the file’s type."[1]

Overview Edit

In some operating systems (for example Unix) it is optional, while in some others (such as Windows) it is a requirement. Some operating systems limit the length of the extension (such as DOS and OS/2, to three characters) while others (such as Unix) do not. Some operating systems (for example RISC OS) do not use file extensions.

Common file extension names include:

References Edit

  1. NIST Special Publication 800-69, at E-1.


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