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{{Short description|Filename suffix that indicates the file's type}}
{{more citations needed|date=November 2015}}
A '''filename extension''', '''file name extension''' or '''file extension''' is a suffix to the [[filename|name]] of a [[computer file]] (for example, <code>.txt</code>, <code>.docx</code>, <code>.md</code>,
<code>.pdf</code>). The extension indicates a characteristic of the file contents or its intended use. A filename extension is typically delimited from the rest of the filename with a [[full stop]] (period), but in some systems<ref>{{cite manual | title = z/VM - Version 7 Release 1 - CMS Primer
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