The important thing to remember is the extension is the last period and the characters that follow it.Īs already said, an operating system knows what programs to use in order to view, print, or edit a particular file by looking at its file extension. This one is a bit tricky, because there are two periods in this file. The extension is the period followed by the remaining characters. To make it easier to see what a files extension are, please see the examples in the chart below: Filename If there is no period in a file, then it does not have an extension. When trying to determine a file's extension it is important to remember that the extension is simply the last period in a file and the characters that follow it. As you can see, the actual extension name gives clues as to the type of file it is. gz, which represent text files, mp3 files, jpeg image files, and files compressed with the gzip program. Some examples of file extensions include. For the most part, file extensions consist of three characters, which are typically letters or digits, that textually represent the type of file it is. There are no particular rules regarding how an extension should be formatted other than it must begin with a period and have at least one character after it. This extension allows the operating system to know what type of file it is and what program to run when you double-click on it. For example, the file extension.txt has an extension of.
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