Now locate the files or folder of files that you want to change the file extensions for in the Finder and select them all, then right-click (or Control Click) and choose “Rename XX Items…”. Check the box for “Show all filename extensions” and then uncheck the box for “Show warning before changing an extension”, then close out of Finder preferences. From the Finder of the Mac, pull down the “Finder” menu and go to “Preferences” and then go to “Advanced”. It’s a subtle difference but important if all you want to do is maintain file names but change the file extensions. We’re going to use the same rename feature that allows batch renaming of files on the Mac but with a few slight modifications to the usage and related system preferences so that it focuses on changing the file extension rather than the file name. This is also not changing the file names, it is only changing the extension that comes as a file suffix. We have plenty of articles about various file format and type conversions if you’re interested in that, however. In File Explorer under View, in the Show/hide group, select the File name extensions check box.īelow is a list of common Windows file name extensions and formats.Remember this is only changing the file extension, this is not actually changing the file type or performing any file conversion. In the search box on the taskbar, type file explorer, and in the search results, select File Explorer. If you don’t see file name extensions when you view files in File Explorer: To learn more about how to change which program will open a file, read Change default programs in Windows 10. You can change a file name extension, but that won't convert the file to another format or change anything else about it except the file name. Most file name extensions are compatible with more than one program that you have installed. For example, the docx extension tells your computer that Microsoft Word can open the file and to display a Word icon when you view it in File Explorer. In expenses.xlsx, for example, the first part of the file name is expenses and the extension is xlsx.Įxtensions tell your computer which application created or can open the file and which icon to use for the file. 
Windows file names have two parts separated by a period: first, the file name, and second, a three- or four-character extension that defines the file type.
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