Rename File Extensions

Rename File Extensions is a small Windows freebie that does exactly what its name says: it changes file extensions of one or multiple files.
The program's GUI is the one that keeps everything very user-friendly, with the plain and simple design requiring you to pick one or multiple files to be processed.
You are allowed to select as many files as you want, no matter their format, with a dedicated option at the bottom of the window to select the new extension.
Sadly, Rename File Extensions doesn't allow users to input new extensions, so you have to rely on the ones that are already available, including ZIP, RAR, HTML, MP3, TXT and JPG.
There are no other settings to configure, which can be only good news for beginners, but also for those who don't want to spend too much time playing with options.
The renaming process is blazing fast and we didn't experience any high CPU usage during our testing.
Obviously, Rename File Extensions runs smoothly on every Windows flavor on the market and although a help manual is not available, that's not at all a problem thanks to the straightforward design.
Simply put, Rename File Extensions may come in handy, although many users probably feel the need for many more configuration options. It does its job with minimum effort though, so the future improvements could only make it better.