How to recover file extension?

Question

Windows

I downloaded a picture from the Internet, but there was a dot in the name (site.ru), and the file was written in the ".ru" format, it does not open in Windows. But it was originally PNG. How to return the PNG format?

Answer 1

rename the file.
if renaming does not allow you to change the file extension - in any folder in the "view" menu, select "options" and there in the "view" tab uncheck "hide extensions", and then rename the file.