Final answer:
To change a file extension on a Mac, first make the extensions visible through Finder Preferences, then select and rename the file with the desired new extension, and confirm the change when prompted.
Step-by-step explanation:
Changing File Extensions on a Mac
To change the extension of a file on a Mac, you'll need to first ensure that the file extension is visible. By default, macOS may hide known file extensions. To show file extensions, open a Finder window, and from the menu bar at the top of the screen, select Finder > Preferences. In the Preferences window, click on the Advanced tab and check the box that says 'Show all filename extensions'.
Once file extensions are visible, you can change them by performing the following steps:
- Select the file whose extension you want to change.
- Press Return or Enter, or click the file name after selecting it to make the name editable.
- Type the new extension after the dot.
- A warning dialog will appear, asking if you are sure you want to change the file extension. Click Use .(new extension) to confirm the change.
Note that changing a file's extension may make it unusable if the extension does not match the file's format. Always make sure that the extension you are changing to is appropriate for the type of file you are working with.