4.2 Rename Files and Folders

     You can change the name of your files or folders as you need to. Just as when you create them, you can change the names to be just about anything you want, using up to 255 characters. Each filename includes a file extension, the part after the period in the name. For example, a Microsoft Word document has a name such as Genealogy.docx, where .docx is the file extension. Unless you are sure what you are doing, avoid changing the file extension, because OS X uses it to associate the file with the application used to open it.