Thanks for the follow-up, leininger609.

Please have a look here:
https://help.maxon.net/c4d/2024/en-us/Default.htm#html/68600.html

The entries for your XRef will show up here. When you right-mouse-click on an entry, you can change the path.

You mentioned placing the linked file on your drive; that wouldn't work with just a relative path.

Relative paths are in use when you "Save with assets." for example, the textures in the tex folder have relative path names, as Cinema 4D is supposed to look into those.

I have tried so far not to waste your time and asked to check with the Support directly. But let me ask you this: will it work when you use:

Preferences> Files> File Assets, and link the folder with the project files there.

Any luck?

All the best