In the Info window for your file, click to open the Open With subcategory. From here, you can select a new application to open files with the same file type. Select an alternative app from the menu, then press the Change All button to apply the change to all files with the same file type. Locate the file extension for which you want to change the default program. If you're not sure what extension the file is using, open File Explorer to find the file and use the View File name extensions option to show file extensions. In the Choose default apps by file type window, select the program to the right of the file extension. How to Change All File Extensions in a Directory via the Command Line. Let’s take a few examples. In the first example, we’re going to change all files in the present working directory with the extension “.txt” and change them to “.py” instead. Aug 27, 2015 Steps to Change File Extension in Windows 10: Step 1: In Windows 10 by default the file extension is hidden. As you can see in the image below the Image file’s. Step 2: Search for the control panel in the Windows search box. Step 3: In the control panel window click on the Appearance.

I need this functionality as well. One poster suggested that you use a third party app to change file extensions, but I believe all that does is copy the file into the app and then allow you to change the file extension. Not change it at the source where you really need to so you can manage the file with other applications in the future.

Lack of ability to manage file extensions for your saved file is a huge gap. One that needs to be closed, among others for an iPad to even be considered a good replacement for Mac OS.

Jan 15, 2018 9:01 PM

This page shows you how to change a file extension in Windows. For example, you might want to rename a file called MyDocument.rtf to MyDocument.txt.
These instructions are for Windows 7 but the same basic process applies to most versions of Windows (see screenshots from Windows XP).

Change File Extension Linux

NOTE: Changing a file extension should only be done if you are confident it's the right thing to do. Test the file thoroughly after the change. If it doesn't work you can easily change the extension back—just make sure you remember what it was!

My Computer

The first thing to do is open Windows Explorer (or My Computer) and view the file you wish to change. We'll use the example of MyDocument.rtf. When we browse to the file it looks like this:

You'll notice that the file does not appear to have an extension—it's just called MyDocument. That's because in this example Windows is set to hide extension names.

If you can already see file extensions on your computer, skip the next step.

If you can't see the file extension, go to organize > Folder and Search Options, then click the View tab. Uncheck the box titled 'Hide extensions for known file types' like so:

Change File Type

Click OK. Now you should be able to see the file extension:

Right-click the file name and select Rename (or left-click and hold down the button for one second). Enter the new extension like so:

After entering the new extension, hit the Enter (return) key. Windows will give you a warning that the file may not work properly. This is quite safe—remember that you can restore the original extension if anything goes wrong.

It's also possible that you might get another message telling you that the file is 'read-only'. In this case either say yes to turning off read-only, or right-click the file, select Properties and uncheck the Read-only box.

If you do not have permission to change the file extension, you may have to login as Administrator. Another option is to make a copy of the file, rename the copy and then delete the original.

Change File Extension Jpg

Note: Windows treats file extensions as case-insensitive, i.e. .RTF is the same as .rtf. However other operating systems do not, and will treat MyDocument.RTF and MyDocument.rtf as two different files. Therefore it is good practice to always treat your files as case-sensitive for maximum compatibility. This is especially crucial if you are going to use the files on the Internet. We recommend that you get into the habit of using all lower-case letters for all file extensions—then there's no confusion.