Most of the time you will have no need to show file extensions, as you can quickly right-click or press the Alt + Enter keys to display the properties of a file, and see what type of a file it is.
However, you might want to show file extensions for the files on your PC at all times.
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This can be done by opening File Explorer, clicking on Options, and selecting the View tab.
Here, you will have to click the tick box for Hide extensions for known file types.
You can also adjust a number of other settings for how files are displayed in this panel, so explore around, and then click OK to make the changes.
Alternatively, a slightly faster way to do this is to select the View pane in the Ribbon at the top of the File Explorer and in the Show/hide section on the right, clicking on the second check box that says File name extensions to switch extensions on or off.
This can be used to quickly change this setting on the fly.