Change the default application for handling files in Ubuntu

As you may have experienced, Ubuntu always likes to open most of the file types with softwares that came preinstalled with it. Some video files wont work with the Movie player and thus you are forced to right click every time time you want to open a video. Lets learn how to change it,

1] Right click on a video file who's file handler you want to change

2] Select Properties, the propery window appears

3] Click on the Open With tab

4] If the desired program is not in the list, Click Add, then browse for the
program

5] Or click on custom command, type the command for running the program,
eg. "vlc" for running Video Lan Client

6] Clck Add

7] Select the new program by clicking on the Radio button next to it

8] Click Close

9] Now, all the files with the same extension will run with the desired software