I believe the files you are looking for are in the OFFICIAL folder, which I try to avoid venturing in to. All your existing Control Assignments are backed up in the cloud. Which does not mean if you make changes, to the existing Control Assignments, a duplicate exists that you could revert to.
For your particular case, I think it would be better to simply make a duplicate of your current control settings, and give it a new name before you make changes. You can do this from the Preset Manager (OPTIONS|CONTROLS) look at bottom left of screen. That way you can always return to your original profile (right/left arrows below assigned device).