The folder with the file should then open. Locate the file then right click on it and select ‘rename’. You can see in my example that the file extension is currently ‘m4a’. Please change this to ‘m4r’. You will get a warning message saying that changing the file extension may leave the file unusable, simply ok it.
(Some people may find that when they rename their file, the file extension (m4a in this example) isn’t visible. If this is the case, go to ‘Organise>Folder and Search Options>View’ and then uncheck the option ‘Hide Extensions for Known File Types’. Please note that this advice is for people running Microsoft Vista and other operating systems may vary).
