How to easily change file extension on windows
Here a simple to How to easily change file extension on windows 10
and heres how Displaying the File Extension in Windows Vista and Windows 7
Click the Start menu. ...
Type "folder options" (without the quotes). ...
A dialog box with the title "Folder Options" will appear. ...
Click to uncheck the box for "Hide extensions for known file types".
Click the "OK" button at the bottom of the dialog box.
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