Jeff Hostetler <git@xxxxxxxxxxxxxxxxx> writes: >> How do you know when a guid needs adaption? > > I'm not sure I know what you mean by "adaption". I think he meant adapting, and I think he is referring to what I wrote in the message upthread to explain why "file ID" would not help. It seems to me, from reading the remainder of your message, that it is also becoming clear to you that "file ID" would not help and your conceptual thing was merely a hand-waving that was dubious how it could be made into a concrete working design? Hopefully we can converge on a workable design that does not involve "file ID", and that would be a good outcome.