meaning of filename

1. filename extension extension> The portion of a filename, following the final point, which indicates the kind of data stored in the file. Many operating systems use filename extensions, e. g. Unix, VMS, MS-DOS, Microsoft Windows. They are usually from one to three letters some sad old OSes support no more than three. Examples include "c" for C source code, "ps" for PostScript, "txt" for arbitrary text. NEXTSTEP and its descendants also use extensions on directories for a similar purpose. Apart from informing the user what type of content the file holds, filename extensions are typically used to decide which program to launch when a file is "run", e. g. by double-clicking it in a GUI file browser. They are also used by Unixs make to determine how to build one kind of file from another. Compare: MIME type. Tony Warrs comprehensive list http://camalott. com/~rebma/filex. html. FAQS. org Graphics formats http://www. faqs. org/faqs/graphics/fileformats-faq/.


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