Concept

Filename extension

Summary
A filename extension, file name extension or file extension is a suffix to the of a (for example, .txt, .docx, .md). 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 it is separated with spaces. Other extension formats include dashes and/or underscores on early versions of Linux and some versions of IBM AIX. Some 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 handling Filesystems for UNIX-like operating systems do not separate the extension metadata from the rest of the file name. The dot character is just another character in the main filename. A file name may have no extensions. Sometimes it is said to have more than one extension,
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