How to rename .cpp files to .h?

Hello,
I am here with one simple question: Is there any possibility to change .cpp code files to .h? I heard somewhere, that it is possible just simple renaming it, but I can't even imagine how I have to do it? Do I have to have some unique converters?

thanks for your attention;
I am a total newbie, don't judge people:)

Renaming a .cpp file to .h is dead easy. Just do it using the PC's OS but there is more to it than that because what they contain is expected to be different.

Why do you want to do it ?

Thank you for your answer. I got stuck in this previous post, guy said me to rename it, but as you know I can't do it, I have to learn it.

http://forum.arduino.cc/index.php?topic=399950.0

He just renamed them. That's all.

Am I a complete idiot or is there some problems :o ??? There is no any .cpp to change. For example .dll files i can rename, but for .cpp it's impossible...