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How to Change File Extension

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The file extension helps the computer know what file it is and what kind of software on the computer can open the file. The easiest way to change the file extension is to save it to a different file type from within a piece of software. Although changing the extension in the file name does not change the file type, it will change the way the computer recognizes the file. In Windows and Mac OS X, the file extension is usually hidden. This article shows how to save files as a different file type in almost any software, and shows how to display file extensions in Windows and Mac OS X.

Change file extension in most software

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Image titled Change a File Extension Step 1

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Open the file with the default software.
Image titled Change a File Extension Step 2

Image titled Change a File Extension Step 2

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Click the File menu and then click Save As.
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Image titled Change a File Extension Step 3

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Select the location to save the file.
Image titled Change a File Extension Step 4

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Image titled Change a File Extension Step 4

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Name (File name) for the file.
Image titled Change a File Extension Step 5

Image titled Change a File Extension Step 5

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In the Save As pane, look for a drop-down menu that says Save As Type or Format.
Image titled Change a File Extension Step 6

Image titled Change a File Extension Step 6

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Select a new file type from the drop-down menu.
Image titled Change a File Extension Step 7

Image titled Change a File Extension Step 7

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Click Save. The original file is still open in the software.
Image titled Change a File Extension Step 8

Image titled Change a File Extension Step 8

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Search for the new file at the selected location.

Show file extensions on Windows

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Image titled Change a File Extension Step 9

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Open the Control Panel. Click the Start menu and then click Control Panel. If you are using Windows 8, click here.
Image titled Change a File Extension Step 10

Image titled Change a File Extension Step 10

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Click Appearance and Personalization in the Contrp Panel.

  • In Windows 8, click Options in the Ribbon interface.
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Image titled Change a File Extension Step 11

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Click Fpder Options.
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Image titled Change a File Extension Step 12

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Click View in the Fpder Options pane.
Image titled Change a File Extension Step 13

Image titled Change a File Extension Step 13

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Show file extension. In the Advanced settings list, scroll down until you see Hide extensions for known file types. Click the square to clear the check.
Image titled Change a File Extension Step 14

Image titled Change a File Extension Step 14

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Click Apply and then click OK .
Image titled Change a File Extension Step 15

Image titled Change a File Extension Step 15

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Open Windows Explorer to see the file extension.

Show file extensions on Windows 8

Image titled Change a File Extension Step 16

Image titled Change a File Extension Step 16

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Open Windows Explorer.
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Image titled Change a File Extension Step 17

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Click View.
Image titled Change a File Extension Step 18

Image titled Change a File Extension Step 18

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In the View/Hide section, check the box for File name extensions.
Image titled Change a File Extension Step 19

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Image titled Change a File Extension Step 19

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When opening a new Windows Explorer window, the file extension will appear.

Show file extensions on Mac OS X

Image titled Change a File Extension Step 20

Image titled Change a File Extension Step 20

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Select a Finder window or open a new Finder window. You can also click Desktop to switch to Finder.
Image titled Change a File Extension Step 21

Image titled Change a File Extension Step 21

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Click the Finder menu, and then click Preferences.
Image titled Change a File Extension Step 22

Image titled Change a File Extension Step 22

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Click Advanced in the Finder Preferences window.
Image titled Change a File Extension Step 23

Image titled Change a File Extension Step 23

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Check the box Show all filename extensions (Show all file extensions).
Image titled Change a File Extension Step 24

Image titled Change a File Extension Step 24

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Close the Finder Preferences window.
  • Image titled Change a File Extension Step 25

    Image titled Change a File Extension Step 25

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    Open a new Finder window. The file extension is now displayed.

    • The file extension helps the computer know what file it is and what kind of software on the computer can open the file. The easiest way to change the file extension is to save it to a different file type from within a piece of software. Although changing the extension in the file name does not change the file type, it will change the way the computer recognizes the file. In Windows and Mac OS X, the file extension is usually hidden. This article shows how to save files as a different file type in almost any software, and shows how to display file extensions in Windows and Mac OS X.

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