@AlexC I have seen these too, and mostly they have been used in reference to a coordinate system. Allows multiple people to work on the same project and have exact placement on objects. I believe they end up as a Null when imported in Cinema

Thanks Dr Sassi! I was reading a post in a different forum that others recommending using an absolute path vs. a relative path? Would you know how to do that with the xref file?

Thank you Dr Sassi! I have created a support ticket, and wanted to check here just in case anyone had some solutions. Hopefully it will be an easy fix.

I have a bunch of files that are linked to an xref that will no longer open. In the task manager at the bottom it shows that it is "loading" and at the end the time remaining just goes up and up, and C4d becomes unresponsive. These files are on a network for work. If I save the xref file locally onto my computer it will open, but all the scene files that are referencing that file will not open, even if saved to my computer as they are still searching for the xref file on the network.