File Explorer is the built-in file management application that comes with Windows. It is one of the most essential and used apps in Windows 10 that enables you to open, move, copy, rename ...
File Explorer is the default on Windows PCs, but it's not the prettiest app for file management. That title goes to Files, a third-party file explorer available on Windows 11 and Windows 10.
This will show you all of the file names of all the files in that location. Type ren "FILENAME.OLD-EXTENSION" "FILENAME.NEW- EXTENSION" with the filename as the name of the file and the old extension ...