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1. #How to change a file extension how to#
2. #How to change a file extension mac os#
3. #How to change a file extension mac#

There may come a time that you wish to change a default association so that you can use a different program to automatically open the file.

#How to change a file extension how to#

How to change the program associated with a file extensionĪs already mentioned, file extensions are mapped to a particular program so that when you attempt to use the file, the operating system knows which application to launch. This will be described in tutorials that can be found in the Further Reading section below. It is also possible to change the program that your operating system uses to open a particular extension.

#How to change a file extension mac#

#How to change a file extension mac os#

Typically, if the extension is unknown to the operating system or no application mapping exists, it will prompt the user to specify the program that it would like to open the file with.īy defaults, Windows and the Mac OS do not show file extensions. Using this information, when a user clicks on a file, the operating reads the file extension and then launches the mapped application. It is able to do this because each operating system has in its configuration a default mapping between a particular file extension and a particular program. 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. 3 How malware writers use extensions to trick you into running a virusĪ file extension, or file name extension, is the letters immediately shown after the last period in a file name.2 How to change the program associated with a file extension.