![]() ![]() Some components of Multics, and applications running on it, use suffixes to indicate file types, but not all files are required to have a suffix - for example, executables and ordinary text files usually have no suffixes in their names.įile systems for UNIX-like operating systems also store the file name as a single string, with "." as just another character in the file name. It allows for variable-length filenames, permitting more than one dot, and hence multiple suffixes, as well as no dot, and hence no suffix. The Multics file system stores the file name as a single string, not split into base name and extension components, allowing the "." to be just another character allowed in file names. Operating system and file system support Some file systems 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. 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. ![]() The extension indicates a characteristic of the file contents or its intended use.
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