Where does Ableton store the I/O labels I enter?

[SinclairUser]

Howdy, I've got a lot of custom labelled mono ins/outs stereo ins/outs for two different large IO interfaces and thought would be a good idea to back up all the labelling and also to transfer to a second machine . Looking through everywhere can't find where they are stored - are they in a preference file, or database somewhere? any idea how I can extract them? thanks in advance