File extension

File extension is a suffix to the name of a file applied to indicate the encoding convention of its contents. Often file extensions are used by computer to identify how the file is to be used and what programs can be used to open them.

See also

• Function ChangeFileExt Change the extension of a filename.
• Function ExtractFileExt Return the extension from a filename.
• File extensions Extensive list of file extensions grouped by category
• Alphabetical list of file extensions

---

From the Free Pascal wiki, page "File extension", as it stood on 2021-01-09 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.