How to Manually Change the File Extension in Vista
Windows Vista labels its files with extensions that identify what type of information each file contains. Changing an extension will not change a file's contents, but sometimes extensions are mislabeled or are interchangeable. You can change the extension in Windows Vista using the built-in rename feature once the ability to view extensions has been enabled.
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Instructions
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Press the "Windows" logo icon on the task bar and select "Control Panel."
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Click "Appearance and Personalization."
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Click "Folder Options."
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Click the "View" tab.
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Remove the check mark next to "Hide extensions for known file types" if it is currently checked.
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Click "OK."
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Open Windows Explorer and navigate to the file you want to rename. Right-click the file, then click "Rename."
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Highlight the text following the last period in the file name, such as "jpg" in "robot.jpg."
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Type the new file extension, such as "png" to change "robot.jpg" to "robot.png."
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