Saving the sketch

Hi all ...
Less than there is this forum ...
When I save the sketch, I saved as * .ino
I have understood that should be saved as * .pde
I wonder what is happening ... I am working with UNO.
Greetings and thank you very much.

just check version of IDE you using.

Arduino IDE uses v.0.XX .ino files

MPIDE IDE & arduino 0023 Uses .PDE file as extention

I found .pde extention based IDE wont support much library

The .pde extension was left over from Arduino IDE forking the Processing Development Environment. As of Arduino 1.0.0 (November 30, 2011) the preferred extension is .ino.