In Windows 10, most file extensions are hidden by default.
I said most because of a few file extensions such as .mui and .cpl is displayed by default.
You can see these file extensions in the System32 folder (which you can find in C: > Windows) of your PC. Remember that these extensions cannot be hidden.
With that said, let’s look at three different ways to hide or display file extensions in Windows 10.
Open the File Explorer by pressing Windows + E.
Click on the View tab on the ribbon.
Open the File Explorer Options. Here’s our guide if you need help with this.
Navigate to the View tab.
Click on the “OK” button at the bottom.
Before proceeding, I recommend taking a backup of the Registry.
Go to the following: HKEY_CURRENT_USER > Software > Microsoft > Windows > CurrentVersion > Explorer > Advanced.
Locate HideFileExt in the right pane and double-click it.
In the Value data field, provide 0 (to show) or 1 (to hide).
Hit the OK button.