| In computer operating systems, a file name extension is
an optional addition to the file name in a suffix of the form ".xxx"
where "xxx" represents a limited number of alphanumeric characters
depending on the operating system. (In Windows 3.1, for example, a file
name extension or suffix can have no more than three characters, but in
Windows 95 and later, it can have more.) The file name extension allows
a file's format to be described as part of its name so that users can quickly
understand the type of file it is without having to "open" or
try to use it. The file name extension also helps an application program
recognize whether a file is a type that it can work with.
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