Blender Source File Path How can I define path of source files such as video, image, etc relative to blend file instead of absolute path in Windows?

In blender, when I want to define path of source files I use their absolute path.

When I change blender file location, connection between blender file and the videos, images, ... linked to it get broken.

As I asked how can I define path of sources used in blender file, relative to blender file, instead of using absolute path in Windows?
Just to illustrate cegaton's comment.  

Filepaths in Blender are saved as relative by default.

You can still change them to absolute/relative though.
File > External Data > Make all paths relative/absolute.    



You can also change this default behavior in preferences:
Edit > Preferences > Save &amp; Load



On top of that, you can set default relative/absolute paths for some types of data (scripts, textures, etc...)
Just go to Edit > Preferences > File Paths