Filename extension: Difference between revisions

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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>). 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]] (period), but in some systems<ref>{{cite manual
| title = z/VM - Version 7 Release 1 -.2 CMS Primer
| id = SC24-6265-0001
| section = What Is a File?
| section-url = https://www.ibm.com/servers/resourcelink/svc0302a.nsf/pages/zVMV7R1sc246265zVMV7R2sc246265/$file/dmsb2_v7r1dmsb2_v7r2.pdf#page=2123
| page = 7
| quote = One thing you need to know about creating files with z/VM is that each file needs its own three-part identifier. The first part of the identifier is the file name. The second part is the file type. And the third part is the file mode. These three file identifiers are often abbreviated fn ft fm.
| date = 20182021-0912-1105
| url = https://www.ibm.com/servers/resourcelink/svc0302a.nsf/pages/zVMV7R1sc246265zVMV7R2sc246265/$file/dmsb2_v7r1dmsb2_v7r2.pdf
| publisher = IBM
}}
</ref> it is separated with spaces.
 
Some [[file systemssystem]]s implement filename extensions as a feature of the file system itself and may limit the length and format of the extension, while others treat filename extensions as part of the filename without special distinction.
 
== Operating system and file system support ==