Usually, you right click on a file and then rename it to change its extension. But what if you got so many files to be change?
Using this little trick, you can change the extension for all files in a folder automatically using the command prompt tool. As example, if you have 100 mp3 files in a folder and want to change it to .jpg file format for security, this is the command that you should use.
ren *.mp3 *.jpg
Screenshot:

July 30th, 2008 at 10:57 am
EXCELLENT…>>> THANKS!!!!!!!!!!!
March 17th, 2009 at 2:07 am
Thanks alot! This is freaking cool! Saves my wrist from ctrl-v to paste the html extension to my files! You’re beyond awesome!!!!
October 9th, 2009 at 2:55 pm
Worked great. I had a ton (200-300)of png files that I wanted to change to ico files and this saved the day. Thanks
December 6th, 2009 at 12:12 am
thanks!!! that was helpful!
June 30th, 2010 at 5:40 am
Awesome, dude. Thanks a ton!
July 8th, 2010 at 6:11 pm
Thanks!