There are many situations that can make you think of changing an extension in a file. For example, if a file is saved with an incorrect extension, you want to use a new default application to open the file or if you want to refuse execution of the file.

This post contains two methods to change file extension on Microsoft Windows:

Firstly, you can change file extension with the software you use to save the file.

Secondly, you can use file explorer to change file extension on Microsoft Windows.

To be able to see the extension of a file on Windows 10, remember to uncheck ” Hide extensions for known file types ” in folder options, advanced settings in the display tab.

Select the file you want to change the extension.

Right click on it and select rename.

Add the new extension you want for the file and press Enter.

A window will appear with a message like this:

If you change a file extension, the file might become unusable.

Are you sure you want to change it?

Click Yes