In my case I used a video file in VSE cut into many parts. 
When the project grew up, I needed to reorganize the linked files. I renamed this video file. Now blender doesn't see this file.

In Motion5, there is a function "Replace Media" that lets you replace external files used in many strips by new one for the whole project.

Does something similar exist in Blender by default or does anybody know script that can do this?
Thank you for your help