How to change default app for files which does not have one?

I made backup from old computer to be used in new laptop.
In old computer I had 32bit Notepad++ in use and this new one has 64bit version.
Now when I want to open file which has no associated program I get error seen in picture.

image

This is very annoying problem especially while trying to open file from ftp folder.

How can I change app path to correct target?

W

You most likely configured that under Preferences / File Operations / Double-click on Files in the past, and need to update it.