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Changing file extensions could possibly render the file unreadable Caution should be taken when you change the extensions as you could possibly render the file unreadable. The application needs to have an extension that can understand its format. But if you're sure you need to change a file extension, here's how: 1. Open a folder and go to View, Folder Options. 2. Click the View tab and uncheck the box that says Hide File Extensions For Known File Types. 3. When you rename a file from that point forward, you can type a period and three letter characters to give it a new extension.
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