"Use relative path for file within database folder". How does it work?

[cnewtonne]

Trying to understand how it works as the documentation is lacking (as i did not see it).

I have an info item 1 in db 1 linked to info item 2 in db 2. DB 1 and 2 are placed in same folder. I renamed this folder. Now, clicking on info item 1 fails to open info item 2 with db can not be found.

It does not matter if the "use relative path ..' box is checked or not.

What am I missing?